howdy fellow radio saddists!
i'm currently torturing this beast of an rca and as it turns out it's me being tortured.

now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it-that said,i have replaced the electrolytics and 2 other caps,plus 2 open 470k resistors,same problem as original-no reception.

i'm fairly certain the oscillator is not working,is ther a voltage check i can do to confirm/deny operation?

all voltages listed on schematic here are present and accounted for,thanks,phil

http://www.nostalgiaair.org/Resources/837/M0015837.htm

:now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it

? ? ? ? ? ? ? ?

Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.

hi edd!!
are you well sir??
audio section is fine,front end troubles for sure.
i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
thanks and check back tonight.
phil

:
:
:

: : : : : : :Sir Phil . . . . . : : : : :First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. : : :Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. : : :Sooooo IF you come to your senses. : : :Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. : : :The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. : : :Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. : : :Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. : : :On one of those conditions you certainly should have been able to evaluate your AF and the speaker. : : : : : :Le local oscillateur test: : : : :Should be in Broadcast band switch position. : : :The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. : : :Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. : : :To do so: : : :Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. : : :Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. : : : :Second option for local oscillator test: : : :The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. : : : :Thassit . . . : : : : : : : : :73's de Edd : : : :

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::
:::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
::
:: ? ? ? ? ? ? ? ?
::
::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
::
::
::
::
::
:

o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
where next sir?
any ideas on how to test individual sections of osc coil?
phil

:hi edd!!
:are you well sir??
:audio section is fine,front end troubles for sure.
:i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:thanks and check back tonight.
:phil
:
:
::
::
::

:: :: :: :: :: :: ::Sir Phil . . . . . :: :: :: :: ::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. :: :: ::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. :: :: ::Sooooo IF you come to your senses. :: :: ::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. :: :: ::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. :: :: ::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. :: :: ::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :: :: ::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :: :: :: :: :: ::Le local oscillateur test: :: :: :: ::Should be in Broadcast band switch position. :: :: ::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :: :: ::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :: :: ::To do so: :: :: ::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :: :: ::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :: :: :: ::Second option for local oscillator test: :: :: ::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :: :: :: ::Thassit . . . :: :: :: :: :: :: :: :: ::73's de Edd :: :: :: ::

::
::
::
::
::
::
::
::
::
::
::
::
:::
::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
:::
::: ? ? ? ? ? ? ? ?
:::
:::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:::
:::
:::
:::
:::
::
:

well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
thanks,phil

:o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:where next sir?
:any ideas on how to test individual sections of osc coil?
:phil
:
:
::hi edd!!
::are you well sir??
::audio section is fine,front end troubles for sure.
::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
::thanks and check back tonight.
::phil
::
::
:::
:::
:::

::: ::: ::: ::: ::: ::: :::Sir Phil . . . . . ::: ::: ::: ::: :::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. ::: ::: :::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. ::: ::: :::Sooooo IF you come to your senses. ::: ::: :::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. ::: ::: :::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. ::: ::: :::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. ::: ::: :::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. ::: ::: :::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. ::: ::: ::: ::: ::: :::Le local oscillateur test: ::: ::: ::: :::Should be in Broadcast band switch position. ::: ::: :::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. ::: ::: :::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. ::: ::: :::To do so: ::: ::: :::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. ::: ::: :::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. ::: ::: ::: :::Second option for local oscillator test: ::: ::: :::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. ::: ::: ::: :::Thassit . . . ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: :::

:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::::
:::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
::::
:::: ? ? ? ? ? ? ? ?
::::
::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
::::
::::
::::
::::
::::
:::
::
:

I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.

:well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:thanks,phil
:
:
::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
::where next sir?
::any ideas on how to test individual sections of osc coil?
::phil
::
::
:::hi edd!!
:::are you well sir??
:::audio section is fine,front end troubles for sure.
:::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:::thanks and check back tonight.
:::phil
:::
:::
::::
::::
::::

:::: :::: :::: :::: :::: :::: ::::Sir Phil . . . . . :::: :::: :::: :::: ::::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. :::: :::: ::::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. :::: :::: ::::Sooooo IF you come to your senses. :::: :::: ::::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. :::: :::: ::::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. :::: :::: ::::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. :::: :::: ::::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :::: :::: ::::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :::: :::: :::: :::: :::: ::::Le local oscillateur test: :::: :::: :::: ::::Should be in Broadcast band switch position. :::: :::: ::::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :::: :::: ::::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :::: :::: ::::To do so: :::: :::: ::::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :::: :::: ::::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :::: :::: :::: ::::Second option for local oscillator test: :::: :::: ::::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :::: :::: :::: ::::Thassit . . . :::: :::: :::: :::: :::: :::: :::: :::: ::::73's de Edd :::: :::: :::: ::::

::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
:::::
::::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
:::::
::::: ? ? ? ? ? ? ? ?
:::::
:::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:::::
:::::
:::::
:::::
:::::
::::
:::
::
:

hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
need someone wiyh much more experience than me to figure this one out.
phil

:I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:
::well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
::thanks,phil
::
::
:::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:::where next sir?
:::any ideas on how to test individual sections of osc coil?
:::phil
:::
:::
::::hi edd!!
::::are you well sir??
::::audio section is fine,front end troubles for sure.
::::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
::::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
::::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
::::thanks and check back tonight.
::::phil
::::
::::
:::::
:::::
:::::

::::: ::::: ::::: ::::: ::::: ::::: :::::Sir Phil . . . . . ::::: ::::: ::::: ::::: :::::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. ::::: ::::: :::::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. ::::: ::::: :::::Sooooo IF you come to your senses. ::::: ::::: :::::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. ::::: ::::: :::::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. ::::: ::::: :::::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. ::::: ::::: :::::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. ::::: ::::: :::::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. ::::: ::::: ::::: ::::: ::::: :::::Le local oscillateur test: ::::: ::::: ::::: :::::Should be in Broadcast band switch position. ::::: ::::: :::::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. ::::: ::::: :::::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. ::::: ::::: :::::To do so: ::::: ::::: :::::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. ::::: ::::: :::::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. ::::: ::::: ::::: :::::Second option for local oscillator test: ::::: ::::: :::::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. ::::: ::::: ::::: :::::Thassit . . . ::::: ::::: ::::: ::::: ::::: ::::: ::::: ::::: :::::73's de Edd ::::: ::::: ::::: :::::

:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
::::::
:::::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
::::::
:::::: ? ? ? ? ? ? ? ?
::::::
::::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
::::::
::::::
::::::
::::::
::::::
:::::
::::
:::
::
:

hi edd!
jeez i hope i cover all your q's.
full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.

i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..

after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.

eye tube is reating to the signals,way better with my finger jabbed in there.

and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.

phil-waiting on further mentoring/learning

:
:

: : : : : : :Sir Phil. . . . . : : : : : : : :Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. : : :Lets break down your info supplements and analyze them now: : : : : : :o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . : : : :With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. : : :Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. : : :OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. : : : : : :BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. : : : :Not to me, in there being two possibilities there: : : :First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. :That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. : : :Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. : : :Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) : : :Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. : : :Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. : : :That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. : : :That would confirm that the local oscillator, on the RCA is actually operating. : : :I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, : : :But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your :display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. :If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. : :There isn't any switch associated with phono input that might be in that phono input, is there ? : : :This would now lead down to the next statement of: : : : :tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) :no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? : : : :If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. : : :In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. : : :You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. : : :Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. : : : :Standing by for supplemental replies . . . . : : : : : : :73's de Edd : : : :

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:
:
:
:
:
:
:
:hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
:tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
:no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
:need someone wiyh much more experience than me to figure this one out.
:phil
:
:I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:thanks,phil
:
:o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:where next sir?
:any ideas on how to test individual sections of osc coil?
:phil
:
:hi edd!!
:are you well sir??
:audio section is fine,front end troubles for sure.
:i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:thanks and check back tonight.
:phil
:
:
:

: : : : :Sir Phil . . . . . : :First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. : :Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. : :Sooooo IF you come to your senses. : :Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. : :The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. : :Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. : :Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. : :On one of those conditions you certainly should have been able to evaluate your AF and the speaker. : :Le local oscillateur test: : :Should be in Broadcast band switch position. : :The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. : :Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. : :To do so: : :Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. : :Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. : :Second option for local oscillator test: : :The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. : :Thassit . . . :73's de Edd : : :

:
:now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
: ? ? ? ? ? ? ? ?
:Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:
:IPAddress: ***.225.165.169
:IPAddress: ***.217.199.9
:IPAddress: ***.54.10.196
:

hi edd,while looking for that 22k and not finding it i see the note on schematic that says r5/c23 may be inside the can OR the 3rd type r5 has been omitted,i can't find r5 so it's inside the 2nd can or not installed.
HOWEVER,YOU LED ME TO A DISCOVERY EVEN THOUGH I DON'T UNDERSTAND IT'S SIGNIFICANCE!

oops,sorry for yelling!
with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it.

now i know you'll figure out what going on now because you've been doing this awhile but for now? i haven't a clue what going on,just glad it's finally a radio and not just something i can shock and burn the crap out of myself with!!

waiting for further instructions and explaination as to the fix.
phil

:
:

: : : : : : :Sir Phil . . . . . : : : : :I think that we are getting ever so MUCH closer now, I was hoping to find a much clearer schematic from Bietmans on that unit, but did not find it covered, but I can now work with the Red Ryders one since I am now OUT of the R.F. area of the schema, where the detail was poor. : : :OK now, if you seem to have tuning eye action lets go to your mentioned 2.2 meg resistor (R4) where you have the AVC buss running over to the left of that resistor, while the detected audio is passing over to the right down thru R5 (the 22k resistor). : : :Now let's get out an ~.01-.1 ufd coupling capacitor and connect between the bottom side (its marked [E]) of that 22k resistor and have its other lead going down to the top side of the volume control, which is shown . .schematically just below it. : : :See how your received volume situation is then. : : : : : : :Aside: : : :Been a while, since last seeing a HIPPO-(philcomus) : : : : : : :73's de Edd : : : :

:
:
:
:
:
:
:
:
:
:hi edd!
:jeez i hope i cover all your q's.
:full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.
:
: i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..
:
:after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.
:eye tube is reating to the signals,way better with my finger jabbed in there.
:
:and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.
:
:phil-waiting on further mentoring/learning
:
:
:
:
:

: : : :Sir Phil. . . . . :Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. :Lets break down your info supplements and analyze them now: : :o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . : : : :With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. :Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. :OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. : :BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. : :Not to me, in there being two possibilities there: :First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. :That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. :Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. :Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) :Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. :Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. :That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. :That would confirm that the local oscillator, on the RCA is actually operating. :I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, :But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your :display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. :If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. : :There isn't any switch associated with phono input that might be in that phono input, is there ? :This would now lead down to the next statement of: : :tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) :no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? : :If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. :In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. :You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. :Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. :Standing by for supplemental replies . . . . :73's de Edd : :

:hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
:tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
:no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
:need someone wiyh much more experience than me to figure this one out.
:phil
:I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:thanks,phil
:o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:where next sir?
:any ideas on how to test individual sections of osc coil?
:phil
:
:hi edd!!
:are you well sir??
:audio section is fine,front end troubles for sure.
:i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:thanks and check back tonight.
:phil
:
:
:

: : :Sir Phil . . . . . :First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. : :Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. : :Sooooo IF you come to your senses. : :Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. : :The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. : :Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. : :Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :Le local oscillateur test: : :Should be in Broadcast band switch position. : :The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :To do so: :Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :Second option for local oscillator test: :The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :Thassit . . . :73's de Edd : : :

:
:now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
: ? ? ? ? ? ? ? ?
:Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:
:

mornin' edd!
when connected to volume control..nada-no sound.
next?
thanks,phil

:
:

: : : : : : : :Sir Phil. . . . . : : : : : : : :with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it. : : : :That's cuz you has done wents and totally bypassed the sets voluminous controllaminator, via that direct of a routing. : : : : :So, that DOES mean that the signal area prior to the point which you are now accessing, is all proper, or you would not now have that detectors audio signal. : : :So now alll you merely have to do is continue in the manner suggested of using that DC isolative capacitor and connect it to the top /outer connection of the volume control as was initially mentioned. : : :(If you select the wrong one, you just won't get any sound at all, so move to the other ends terminal.) : : :Then your set should be able to be evaluated . . . volume control and all ! : : :You would then need to check out the circuitry that the present SOURCE of audio follows down, before it normally would end up passing through before reaching that volume control. : : :Which merely seems to be a couple of function switch contacts. Could be erratic contact action from oxidation over time. : : :Will see if I can make those interconnection's routings out . . . on the poor quality of schematic . . .a bit later. : : : : : : :73's de Edd : : : : :

:
:
:
:
:
:
:
:
::hi edd,while looking for that 22k and not finding it i see the note on schematic that says r5/c23 may be inside the can OR the 3rd type r5 has been omitted,i can't find r5 so it's inside the 2nd can or not installed.
::HOWEVER,YOU LED ME TO A DISCOVERY EVEN THOUGH I DON'T UNDERSTAND IT'S SIGNIFICANCE!
::
::oops,sorry for yelling!
::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it.
::
::now i know you'll figure out what going on now because you've been doing this awhile but for now? i haven't a clue what going on,just glad it's finally a radio and not just something i can shock and burn the crap out of myself with!!
::
::waiting for further instructions and explaination as to the fix.
::phil
::
::
:::
:::

::: ::: ::: ::: ::: ::: :::Sir Phil . . . . . ::: ::: ::: ::: :::I think that we are getting ever so MUCH closer now, I was hoping to find a much clearer schematic from Bietmans on that unit, but did not find it covered, but I can now work with the Red Ryders one since I am now OUT of the R.F. area of the schema, where the detail was poor. ::: ::: :::OK now, if you seem to have tuning eye action lets go to your mentioned 2.2 meg resistor (R4) where you have the AVC buss running over to the left of that resistor, while the detected audio is passing over to the right down thru R5 (the 22k resistor). ::: ::: :::Now let's get out an ~.01-.1 ufd coupling capacitor and connect between the bottom side (its marked [E]) of that 22k resistor and have its other lead going down to the top side of the volume control, which is shown . .schematically just below it. ::: ::: :::See how your received volume situation is then. ::: ::: ::: ::: ::: ::: :::Aside: ::: ::: :::Been a while, since last seeing a HIPPO-(philcomus) ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: :::

:::
:::
:::
:::
:::
:::
:::
:::
:::
:::hi edd!
:::jeez i hope i cover all your q's.
:::full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.
:::
::: i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..
:::
:::after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.
:::eye tube is reating to the signals,way better with my finger jabbed in there.
:::
:::and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.
:::
:::phil-waiting on further mentoring/learning
:::
:::
:::
:::
:::

::: ::: ::: :::Sir Phil. . . . . :::Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. :::Lets break down your info supplements and analyze them now: ::: :::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . ::: ::: ::: :::With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. :::Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. :::OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. ::: :::BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. ::: :::Not to me, in there being two possibilities there: :::First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. :::That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. :::Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. :::Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) :::Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. :::Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. :::That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. :::That would confirm that the local oscillator, on the RCA is actually operating. :::I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, :::But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your :::display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. :::If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. ::: :::There isn't any switch associated with phono input that might be in that phono input, is there ? :::This would now lead down to the next statement of: ::: :::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) :::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? ::: :::If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. :::In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. :::You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. :::Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. :::Standing by for supplemental replies . . . . :::73's de Edd ::: :::

:::hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
:::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
:::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
:::need someone wiyh much more experience than me to figure this one out.
:::phil
:::I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:::well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:::thanks,phil
:::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:::where next sir?
:::any ideas on how to test individual sections of osc coil?
:::phil
:::
:::hi edd!!
:::are you well sir??
:::audio section is fine,front end troubles for sure.
:::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:::thanks and check back tonight.
:::phil
:::
:::
:::

::: ::: :::Sir Phil . . . . . :::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. ::: :::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. ::: :::Sooooo IF you come to your senses. ::: :::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. ::: :::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. ::: :::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. ::: :::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :::Le local oscillateur test: ::: :::Should be in Broadcast band switch position. ::: :::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :::To do so: :::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :::Second option for local oscillator test: :::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :::Thassit . . . :::73's de Edd ::: ::: :::

:::
:::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
::: ? ? ? ? ? ? ? ?
:::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:::
:::
::
:

hi edd,thanks for leading me down the path,it's working well now,volume control was bad.
i replaced it with an audio taper,500k,no tap ,not quite the right control but it's working,less control over volume but i have a working radio now,do you think this was the problem from the beginning??
phil

:mornin' edd!
:when connected to volume control..nada-no sound.
:next?
:thanks,phil
:
:
::
::

:: :: :: :: :: :: :: ::Sir Phil. . . . . :: :: :: :: :: :: :: ::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it. :: :: :: ::That's cuz you has done wents and totally bypassed the sets voluminous controllaminator, via that direct of a routing. :: :: :: :: ::So, that DOES mean that the signal area prior to the point which you are now accessing, is all proper, or you would not now have that detectors audio signal. :: :: ::So now alll you merely have to do is continue in the manner suggested of using that DC isolative capacitor and connect it to the top /outer connection of the volume control as was initially mentioned. :: :: ::(If you select the wrong one, you just won't get any sound at all, so move to the other ends terminal.) :: :: ::Then your set should be able to be evaluated . . . volume control and all ! :: :: ::You would then need to check out the circuitry that the present SOURCE of audio follows down, before it normally would end up passing through before reaching that volume control. :: :: ::Which merely seems to be a couple of function switch contacts. Could be erratic contact action from oxidation over time. :: :: ::Will see if I can make those interconnection's routings out . . . on the poor quality of schematic . . .a bit later. :: :: :: :: :: :: ::73's de Edd :: :: :: :: ::

::
::
::
::
::
::
::
::
:::hi edd,while looking for that 22k and not finding it i see the note on schematic that says r5/c23 may be inside the can OR the 3rd type r5 has been omitted,i can't find r5 so it's inside the 2nd can or not installed.
:::HOWEVER,YOU LED ME TO A DISCOVERY EVEN THOUGH I DON'T UNDERSTAND IT'S SIGNIFICANCE!
:::
:::oops,sorry for yelling!
:::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it.
:::
:::now i know you'll figure out what going on now because you've been doing this awhile but for now? i haven't a clue what going on,just glad it's finally a radio and not just something i can shock and burn the crap out of myself with!!
:::
:::waiting for further instructions and explaination as to the fix.
:::phil
:::
:::
::::
::::

:::: :::: :::: :::: :::: :::: ::::Sir Phil . . . . . :::: :::: :::: :::: ::::I think that we are getting ever so MUCH closer now, I was hoping to find a much clearer schematic from Bietmans on that unit, but did not find it covered, but I can now work with the Red Ryders one since I am now OUT of the R.F. area of the schema, where the detail was poor. :::: :::: ::::OK now, if you seem to have tuning eye action lets go to your mentioned 2.2 meg resistor (R4) where you have the AVC buss running over to the left of that resistor, while the detected audio is passing over to the right down thru R5 (the 22k resistor). :::: :::: ::::Now let's get out an ~.01-.1 ufd coupling capacitor and connect between the bottom side (its marked [E]) of that 22k resistor and have its other lead going down to the top side of the volume control, which is shown . .schematically just below it. :::: :::: ::::See how your received volume situation is then. :::: :::: :::: :::: :::: :::: ::::Aside: :::: :::: ::::Been a while, since last seeing a HIPPO-(philcomus) :::: :::: :::: :::: :::: :::: ::::73's de Edd :::: :::: :::: ::::

::::
::::
::::
::::
::::
::::
::::
::::
::::
::::hi edd!
::::jeez i hope i cover all your q's.
::::full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.
::::
:::: i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..
::::
::::after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.
::::eye tube is reating to the signals,way better with my finger jabbed in there.
::::
::::and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.
::::
::::phil-waiting on further mentoring/learning
::::
::::
::::
::::
::::

:::: :::: :::: ::::Sir Phil. . . . . ::::Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. ::::Lets break down your info supplements and analyze them now: :::: ::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . :::: :::: :::: ::::With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. ::::Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. ::::OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. :::: ::::BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. :::: ::::Not to me, in there being two possibilities there: ::::First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. ::::That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. ::::Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. ::::Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) ::::Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. ::::Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. ::::That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. ::::That would confirm that the local oscillator, on the RCA is actually operating. ::::I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, ::::But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your ::::display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. ::::If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. :::: ::::There isn't any switch associated with phono input that might be in that phono input, is there ? ::::This would now lead down to the next statement of: :::: ::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) ::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? :::: ::::If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. ::::In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. ::::You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. ::::Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. ::::Standing by for supplemental replies . . . . ::::73's de Edd :::: ::::

::::hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
::::need someone wiyh much more experience than me to figure this one out.
::::phil
::::I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
::::well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
::::thanks,phil
::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
::::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
::::where next sir?
::::any ideas on how to test individual sections of osc coil?
::::phil
::::
::::hi edd!!
::::are you well sir??
::::audio section is fine,front end troubles for sure.
::::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
::::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
::::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
::::thanks and check back tonight.
::::phil
::::
::::
::::

:::: :::: ::::Sir Phil . . . . . ::::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. :::: ::::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. :::: ::::Sooooo IF you come to your senses. :::: ::::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. :::: ::::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. :::: ::::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. :::: ::::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. ::::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. ::::Le local oscillateur test: :::: ::::Should be in Broadcast band switch position. :::: ::::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. ::::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. ::::To do so: ::::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. ::::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. ::::Second option for local oscillator test: ::::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. ::::Thassit . . . ::::73's de Edd :::: :::: ::::

::::
::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
:::: ? ? ? ? ? ? ? ?
::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
::::
::::
:::
::
:

one more question edd,what does c10 do? does it have anything to do with tracking?
mine's off a bunch,c10 looks like a brass rod with a lock nut,is it just an up and down adjustment?
1420 kc comes in at about 1250 kc.
thanks,phil

:hi edd,thanks for leading me down the path,it's working well now,volume control was bad.
:i replaced it with an audio taper,500k,no tap ,not quite the right control but it's working,less control over volume but i have a working radio now,do you think this was the problem from the beginning??
:phil
:
::mornin' edd!
::when connected to volume control..nada-no sound.
::next?
::thanks,phil
::
::
:::
:::

::: ::: ::: ::: ::: ::: ::: :::Sir Phil. . . . . ::: ::: ::: ::: ::: ::: ::: :::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it. ::: ::: ::: :::That's cuz you has done wents and totally bypassed the sets voluminous controllaminator, via that direct of a routing. ::: ::: ::: ::: :::So, that DOES mean that the signal area prior to the point which you are now accessing, is all proper, or you would not now have that detectors audio signal. ::: ::: :::So now alll you merely have to do is continue in the manner suggested of using that DC isolative capacitor and connect it to the top /outer connection of the volume control as was initially mentioned. ::: ::: :::(If you select the wrong one, you just won't get any sound at all, so move to the other ends terminal.) ::: ::: :::Then your set should be able to be evaluated . . . volume control and all ! ::: ::: :::You would then need to check out the circuitry that the present SOURCE of audio follows down, before it normally would end up passing through before reaching that volume control. ::: ::: :::Which merely seems to be a couple of function switch contacts. Could be erratic contact action from oxidation over time. ::: ::: :::Will see if I can make those interconnection's routings out . . . on the poor quality of schematic . . .a bit later. ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: :::

:::
:::
:::
:::
:::
:::
:::
:::
::::hi edd,while looking for that 22k and not finding it i see the note on schematic that says r5/c23 may be inside the can OR the 3rd type r5 has been omitted,i can't find r5 so it's inside the 2nd can or not installed.
::::HOWEVER,YOU LED ME TO A DISCOVERY EVEN THOUGH I DON'T UNDERSTAND IT'S SIGNIFICANCE!
::::
::::oops,sorry for yelling!
::::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it.
::::
::::now i know you'll figure out what going on now because you've been doing this awhile but for now? i haven't a clue what going on,just glad it's finally a radio and not just something i can shock and burn the crap out of myself with!!
::::
::::waiting for further instructions and explaination as to the fix.
::::phil
::::
::::
:::::
:::::

::::: ::::: ::::: ::::: ::::: ::::: :::::Sir Phil . . . . . ::::: ::::: ::::: ::::: :::::I think that we are getting ever so MUCH closer now, I was hoping to find a much clearer schematic from Bietmans on that unit, but did not find it covered, but I can now work with the Red Ryders one since I am now OUT of the R.F. area of the schema, where the detail was poor. ::::: ::::: :::::OK now, if you seem to have tuning eye action lets go to your mentioned 2.2 meg resistor (R4) where you have the AVC buss running over to the left of that resistor, while the detected audio is passing over to the right down thru R5 (the 22k resistor). ::::: ::::: :::::Now let's get out an ~.01-.1 ufd coupling capacitor and connect between the bottom side (its marked [E]) of that 22k resistor and have its other lead going down to the top side of the volume control, which is shown . .schematically just below it. ::::: ::::: :::::See how your received volume situation is then. ::::: ::::: ::::: ::::: ::::: ::::: :::::Aside: ::::: ::::: :::::Been a while, since last seeing a HIPPO-(philcomus) ::::: ::::: ::::: ::::: ::::: ::::: :::::73's de Edd ::::: ::::: ::::: :::::

:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::hi edd!
:::::jeez i hope i cover all your q's.
:::::full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.
:::::
::::: i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..
:::::
:::::after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.
:::::eye tube is reating to the signals,way better with my finger jabbed in there.
:::::
:::::and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.
:::::
:::::phil-waiting on further mentoring/learning
:::::
:::::
:::::
:::::
:::::

::::: ::::: ::::: :::::Sir Phil. . . . . :::::Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. :::::Lets break down your info supplements and analyze them now: ::::: :::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . ::::: ::::: ::::: :::::With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. :::::Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. :::::OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. ::::: :::::BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. ::::: :::::Not to me, in there being two possibilities there: :::::First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. :::::That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. :::::Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. :::::Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) :::::Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. :::::Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. :::::That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. :::::That would confirm that the local oscillator, on the RCA is actually operating. :::::I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, :::::But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your :::::display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. :::::If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. ::::: :::::There isn't any switch associated with phono input that might be in that phono input, is there ? :::::This would now lead down to the next statement of: ::::: :::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) :::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? ::::: :::::If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. :::::In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. :::::You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. :::::Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. :::::Standing by for supplemental replies . . . . :::::73's de Edd ::::: :::::

:::::hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
:::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
:::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
:::::need someone wiyh much more experience than me to figure this one out.
:::::phil
:::::I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:::::well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:::::thanks,phil
:::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:::::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:::::where next sir?
:::::any ideas on how to test individual sections of osc coil?
:::::phil
:::::
:::::hi edd!!
:::::are you well sir??
:::::audio section is fine,front end troubles for sure.
:::::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:::::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:::::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:::::thanks and check back tonight.
:::::phil
:::::
:::::
:::::

::::: ::::: :::::Sir Phil . . . . . :::::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. ::::: :::::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. ::::: :::::Sooooo IF you come to your senses. ::::: :::::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. ::::: :::::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. ::::: :::::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. ::::: :::::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :::::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :::::Le local oscillateur test: ::::: :::::Should be in Broadcast band switch position. ::::: :::::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :::::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :::::To do so: :::::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :::::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :::::Second option for local oscillator test: :::::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :::::Thassit . . . :::::73's de Edd ::::: ::::: :::::

:::::
:::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
::::: ? ? ? ? ? ? ? ?
:::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
:::::
:::::
::::
:::
::
:

hi edd,the original is actually marked 250k,the tap is at 100k,it's got many breaks in the track so it's a gonner.
no matter,radio is working now.
c10 has a nonthreaded brass rod with a horizonal pinhole thru the top.
it appears that you crack loose the locknut and either push down or pull up to adjust,however it does nothing to change tracking.
of the 5 trimmers on the back apron i was able to use the 1500 kc ant trimmer to move it up but not even close to enough.
suggestions for correcting tracking?
phil

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: : : : : : :Sir Phil . . . . . : : : : :Gone most of weekend but back now . . . I see that you finally found the missing link between the detected audio and the input to the audio stages. : : : :That mentioned C10 is the BCB oscillator trimmer capacitor, if you are finding that much of, station to dial scale logging error, in that particular direction, it is currently compressed up too much with excessive capacitance if a trimmer capacitor. : : : :The other consideration, going by your description is that it is a piston capacitor, it its construction mode, capacitance also usually increases as that adjustment screw is turned clockwise. : : :It is optimally trimmed in such that a station operating at 1500 comes in properly on the dial scale. :Then, your 1420 station should walk back up to its proper dial scale positioning. : : : :Getting back to that volume conrol, with it being completely out of circuit now. : : :Take an ohmmeter and measure from one end to the other and be expecting ~500K or else expect it to be open. : : :Then, if it does confirm to be open, then measure from the grounded end to the center rotor position and slowly run it thru its range from minimum volume position, upwards to then see if the resistance drops off at some point , indicating an open in the resistive element. : : :You may just have an open near the high end of the element due to an open path between the element and the high terminal :OR the control just might be dirty inside. : : :Would be nice to get that original control operational again, as it has a loudness control tap off , which is not easy, if not impossible to find in a replacement control. : : :PLUS the tap off point is not given on the schematis specs, would be nice for you to measure from the ground side of the control up to that tap to see what resistive point it is placed . : : :Will wait to see what you find out, on the original control. : : : : : : : : : : : :73's de Edd : : : :

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:one more question edd,what does c10 do? does it have anything to do with tracking?
::mine's off a bunch,c10 looks like a brass rod with a lock nut,is it just an up and down adjustment?
::1420 kc comes in at about 1250 kc.
::thanks,phil
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:::hi edd,thanks for leading me down the path,it's working well now,volume control was bad.
:::i replaced it with an audio taper,500k,no tap ,not quite the right control but it's working,less control over volume but i have a working radio now,do you think this was the problem from the beginning??
:::phil
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::::mornin' edd!
::::when connected to volume control..nada-no sound.
::::next?
::::thanks,phil
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::::: ::::: ::::: ::::: ::::: ::::: ::::: :::::Sir Phil. . . . . ::::: ::::: ::::: ::::: ::::: ::::: ::::: :::::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it. ::::: ::::: ::::: :::::That's cuz you has done wents and totally bypassed the sets voluminous controllaminator, via that direct of a routing. ::::: ::::: ::::: ::::: :::::So, that DOES mean that the signal area prior to the point which you are now accessing, is all proper, or you would not now have that detectors audio signal. ::::: ::::: :::::So now alll you merely have to do is continue in the manner suggested of using that DC isolative capacitor and connect it to the top /outer connection of the volume control as was initially mentioned. ::::: ::::: :::::(If you select the wrong one, you just won't get any sound at all, so move to the other ends terminal.) ::::: ::::: :::::Then your set should be able to be evaluated . . . volume control and all ! ::::: ::::: :::::You would then need to check out the circuitry that the present SOURCE of audio follows down, before it normally would end up passing through before reaching that volume control. ::::: ::::: :::::Which merely seems to be a couple of function switch contacts. Could be erratic contact action from oxidation over time. ::::: ::::: :::::Will see if I can make those interconnection's routings out . . . on the poor quality of schematic . . .a bit later. ::::: ::::: ::::: ::::: ::::: ::::: :::::73's de Edd ::::: ::::: ::::: ::::: :::::

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::::::hi edd,while looking for that 22k and not finding it i see the note on schematic that says r5/c23 may be inside the can OR the 3rd type r5 has been omitted,i can't find r5 so it's inside the 2nd can or not installed.
::::::HOWEVER,YOU LED ME TO A DISCOVERY EVEN THOUGH I DON'T UNDERSTAND IT'S SIGNIFICANCE!
::::::
::::::oops,sorry for yelling!
::::::with a jumper lead from can side of the 2.2 meg to pin 3 of the 6sf5 the radio receives well all across the dial but volume is maxed out and very loud and clear,volume control does not control it.
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::::::now i know you'll figure out what going on now because you've been doing this awhile but for now? i haven't a clue what going on,just glad it's finally a radio and not just something i can shock and burn the crap out of myself with!!
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::::::waiting for further instructions and explaination as to the fix.
::::::phil
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::::::: ::::::: ::::::: ::::::: ::::::: ::::::: :::::::Sir Phil . . . . . ::::::: ::::::: ::::::: ::::::: :::::::I think that we are getting ever so MUCH closer now, I was hoping to find a much clearer schematic from Bietmans on that unit, but did not find it covered, but I can now work with the Red Ryders one since I am now OUT of the R.F. area of the schema, where the detail was poor. ::::::: ::::::: :::::::OK now, if you seem to have tuning eye action lets go to your mentioned 2.2 meg resistor (R4) where you have the AVC buss running over to the left of that resistor, while the detected audio is passing over to the right down thru R5 (the 22k resistor). ::::::: ::::::: :::::::Now let's get out an ~.01-.1 ufd coupling capacitor and connect between the bottom side (its marked [E]) of that 22k resistor and have its other lead going down to the top side of the volume control, which is shown . .schematically just below it. ::::::: ::::::: :::::::See how your received volume situation is then. ::::::: ::::::: ::::::: ::::::: ::::::: ::::::: :::::::Aside: ::::::: ::::::: :::::::Been a while, since last seeing a HIPPO-(philcomus) ::::::: ::::::: ::::::: ::::::: ::::::: ::::::: :::::::73's de Edd ::::::: ::::::: ::::::: :::::::

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:::::::hi edd!
:::::::jeez i hope i cover all your q's.
:::::::full recap now done/all resistors replaced where needed,the only cap not changed is a small value mica under the range switch.
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::::::: i used a philco hippo for osc check,i don't own any transistor radios,had the philco within 5 inches of the r.c.a..
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:::::::after recap i now have 3 volts btw 5 and 6-6sa7 and SOME reception but still weak,only the local flamethrowers coming thru,however when touching the i.f. connection previously mentioned many stations received across the band with clear strong audio.
:::::::eye tube is reating to the signals,way better with my finger jabbed in there.
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:::::::and yes i'm in b.c. mode and i'm using a dmm,a cheapee but it does the job.
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:::::::phil-waiting on further mentoring/learning
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::::::: ::::::: ::::::: :::::::Sir Phil. . . . . :::::::Well, looks like you might be fully dedicated and commited now, what with the bankrolling of a tuning eye tube. That just might bring you ever closer to a solution of the unit, in one tuning referencing aspect. :::::::Lets break down your info supplements and analyze them now: ::::::: :::::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it . ::::::: ::::::: ::::::: :::::::With your next statement just following, I just can't see that unless you possibly could have been using a 1K per volt VOM for doing the metering. :::::::Or using a non auto ranging DVM and not being expecting the voltage to be a negative one and having your test leads polarities arranged accordingly. :::::::OR the swinging of the RCA thru its range but NOT having the HOST receiver tuned in the higher 1000khz upwards to 1710 spectrum. ::::::: :::::::BUT! . . . as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me. ::::::: :::::::Not to me, in there being two possibilities there: :::::::First consideration was the use of a small pocket transistor where you could really get in physically close to that RCA's tuning condenser. Then, one possibility being that if you were close to the antenna section of that tuning condenser and had a good antenna or loop antenna input into the RCA, at one point on the RCA in swinging through its complete its tuning range, it could enhance the signal input on the frequency that the host receiver was left tuned to. :::::::That being made possible by that RCA tuned frequency at that common frequency, inducing a bit of its signal level into the host receiver. But that being solely at that one matching common frequency. :::::::Now what you initially had said, was that you were receiving different stations, therefore that would be dependent upon the RCA sets local oscillator actually being working and for a bit of the IF frequency from the mixer getting coupled thru from the tuning condenser to the host monitoring receiver. :::::::Lets go back to the hook up and have access to the bottom of the RCA's chassis where you then can clip on a test lead of about a foot or two's length onto the 1st grid of the I.F. amplifier tube and then have its other free clip end, being placed up against that host transistor radio receivers cabinet.(Actually the cabint portion housing the internal ferrite-loop antenna bar / rod.) :::::::Tune the host radio down to the very lowest part of the BCB that is being free of an incoming station on that frequency, with its volume turned up. :::::::Now you fire up the RCA and start tuning across the band am I am fully expecting the recepton of stations coming in on the once quiet host receiver, as you then tune across the band of the RCA. :::::::That would now be because you have a HIGH level of 455 signal that is now being passed right on thru the host receivers mixer and then being procesed by that units I.F. strip and detected and passed forward as receive audio. :::::::That would confirm that the local oscillator, on the RCA is actually operating. :::::::I was now going to suggest that you next monotor the AVC buss of the RCA to confirm that the set was working all of the way down to and thru the detector stage of the RCA, :::::::But, with your new acquisition of the tuning eye tube, it might be just as well to merely watch the eye display to now confirm if your :::::::display crescent is opening and closing in response to incoming statons presences, as you are tuning across the BCB with the RCA. :::::::If so you must then have yourself a working RCA with it now , SOMEHOW, lacking that final linking between the detected audio and its input into the AF pre amp stage of the receiver. ::::::: :::::::There isn't any switch associated with phono input that might be in that phono input, is there ? :::::::This would now lead down to the next statement of: ::::::: :::::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up. (Now the question is . . is that the garbled audio of only one station or that of multiple stations as you tune the RCA across the band ? ) :::::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted?? ::::::: :::::::If only one station, I don't think that you have anything abnormal there, as you aparrently are getting into the input stage of the 1st audio preamp tube and injecting your body picked up RF from a strong local station into the low level AF stage, it is then being grid detected by that tubes input and passed on thru the AF portion. :::::::In situations where people don't have a powerhouse AM station / or a nearby lower power one, they are just ending up with a hummmmmm coming from the sets speaker from AC line induced 60 cycle power pickup from house wiring. :::::::You can confirm that , by that station being heard, not changing to being ANOTHER station as you take the other hand and tune the RCA tuning condenser thru its range. :::::::Caveat . . .Be touching a plastic or wooden knob on that tuning shaft, or you other wise would be attenuating or eliminating your "body source" of your picked up station induced RF signal. :::::::Standing by for supplemental replies . . . . :::::::73's de Edd ::::::: :::::::

:::::::hi brian,yeah i went thru that too what with the cab labels gone,i have it b.c. mode.
:::::::tonight i discovered that if i touch the lead of a 200 pf s/m cap to the 2nd i.f. terminal that has the 2.2 meg resistor attached to it reception is good and garbled audio clears up.
:::::::no other connection being made,just 1 lead of the cap and my finger,does the suggest the cap in the can[i assume c22] is shorted??
:::::::need someone wiyh much more experience than me to figure this one out.
:::::::phil
:::::::I have one of these models and didn't realize I was trying to get radio reception while switched on one of the television bands.
:::::::well i guess i'm all in on this one,just picked up a shiney new 6e5 tube on my way home to replace the dud,any help out there fot diaging no reception?
:::::::thanks,phil
:::::::o.k. edd,no voltage between pins5/6 on the 6sa7-tried picking up the osc sqeel on another radio,didn't hear it BUT!as i was tuning around the rca[dead one] the stations were changing on the good/working radio without tuning it ,odd to me.
:::::::as another footnote-i have recapped the radio except for audio section/all tubes tested good or replaced with nos tubes.
:::::::where next sir?
:::::::any ideas on how to test individual sections of osc coil?
:::::::phil
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:::::::hi edd!!
:::::::are you well sir??
:::::::audio section is fine,front end troubles for sure.
:::::::i can get untunable reception by hooking my longwire to a terminal on the osc coil,nothing when connected to the ant. terminal.
:::::::i can confirm all sections of ant. coil o.k. ,all check with low resistance when measured to ground,can't confirm osc coil,can't quite figure out how to check it.
:::::::i'll check for neg. voltage/osc. sqeal when i get home tonight-still harnessed by employment!
:::::::thanks and check back tonight.
:::::::phil
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::::::: ::::::: :::::::Sir Phil . . . . . :::::::First of all, what you have there in your electronics, is a bit more than the typical little rinky-dinky AC/DC AA5 set. ::::::: :::::::Power transformer-higher voltage power supply levels-push pull output AF stages- tuning eye indicator-multi band, etc. ::::::: :::::::Sooooo IF you come to your senses. ::::::: :::::::Initially, confirm some degree of operationality of the AF section and the basic power supply for springing for the price of 1 capacitor in the form of a .01 ufd and take 2 clip leads to extend an be able to connect one of its leads to the high side of the volume control. ::::::: :::::::The other caps lead, via its extension lead, goes to either pin 2 or 7 of one of the AF output tubes. ::::::: :::::::Fire up the set and raise the volume control level to see if you get HUMMMM. If so the power supply and final AF sections are working to a fashion. ::::::: :::::::Now for an even more dynamic test , power down, move the clip lead formerly on the 2-7 of an AF output tube up to one of the plates of the 2 AF output tubes, power up and bring the volume control level up . . . . .nothing ? . . . then power down and move the clip to the plate connection of the other AF output tube. :::::::On one of those conditions you certainly should have been able to evaluate your AF and the speaker. :::::::Le local oscillateur test: ::::::: :::::::Should be in Broadcast band switch position. ::::::: :::::::The local oscillator should be putting out a signal of ~995 khz in its meshed plate condition of the tuning condenser on up to ~2150 khz in its open plate condition. :::::::Therefore you should be able to "listen" for it from the range capabilities of ~1000-1710 khz on a host receiver. :::::::To do so: :::::::Tune the RCA to its meshed plate position, bring the host receive right up to and almost kissing the tuning condenser ( easily done if it is a portable pocket transistor radio). Tune the host receiver to a station between 1000-1600 khz and tune off to the side such that you can just make out the sound / music. :::::::Tune the RCA thru its range and if you hear a strong / shifting whistle at one point , on the host receiver, the RCA is having a working local oscillator. :::::::Second option for local oscillator test: :::::::The unit, when monitored with a DVM, (for imposing minumal circuit loading) will be showing a negative voltage when leads are connected between the cathode and 1st grid of the 6SA7 tube, its voltage level will vary from one end of the tuning condenser range to the other, if it drops out you might have an oscillator plate shorting at one point, most likely to occur at the fully meshed portion. :::::::Thassit . . . :::::::73's de Edd ::::::: ::::::: :::::::

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:::::::now to start this off fair and square,this thing in my opinion is not worth the new caps it would take to properly rebuild it
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:::::::Okay then. Don't bother with it. Not worth the 5 bucks in capacitors. No need to go any further.
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