No voltage on plates

9/17/2013 11:56:21 AMWilliam

I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
Thank you.

9/17/2013 1:20:17 PMCV

Probably no B+ is getting to the IF can primaries. Most likely due to an open resistor running from the B+ bus to one wire of each IF transformer primary (other primary wire goes to plate of the stage's tube). Since at least two tube plates seem to be dead, most likely reason is a failed resistor that feeds both tubes.

9/17/2013 2:02:44 PMCV

Looking at a VERY POOR schematic of this set, it appears that the front-end tubes do NOT have a common resistor feeding the IF transformers from B+. Backup suggestion is that you have a bad solder joint or broken wire connecting the IF transformer primaries' DC bias sides with the B+ bus. Outside of two burned-open transformer primaries (unlikely) I don't know what could cause loss of plate voltages on multiple tubes.
:

9/20/2013 12:20:37 PMWilliam

:Looking at a VERY POOR schematic of this set, it appears that the front-end tubes do NOT have a common resistor feeding the IF transformers from B+. Backup suggestion is that you have a bad solder joint or broken wire connecting the IF transformer primaries' DC bias sides with the B+ bus. Outside of two burned-open transformer primaries (unlikely) I don't know what could cause loss of plate voltages on multiple tubes.
::

O.K......There are some things which I don't understand. I replaced the electric caps but did not replace the old can. I attached the negatives of the new caps to the negative terminals of the can....underneath can. This is my problem!! I am receiving normal/voltages on plates of all tubes when measuring voltage with the negative probes of my meter attached to the negative side of the radio switch, or the main frame of the chassis. When measuring from the negative terminal of the electrolytical caps I don't measure any voltages on the plates. I find this confusing since I assumed that this was the most negative point on the chassis...maybe not?......As I said I think I have my voltage back on the plates but I.m still not picking up any stations......Sorry if I seem to be rambling here.
:
:

9/21/2013 11:02:20 PMCharlie

:I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
:Thank you.
:
Did you solve this problem? I don't have the schematic, but is this a transformerless set?

9/22/2013 2:32:21 PMWilliam

This set has transformers....over the years this radio has had a rough time. I have the case looking great but the chassis has had poor soldering done with terrible wire being used.... However I have discovered a couple of wires disconnected from the ganged switch....maybe...and with the help of the schematic I'm attempting to connect to the correct spot.....the switch or volume control.
I should add that I'm a novice at tube radio but loving it.
:

9/23/2013 9:38:48 AMCV

All radios have transformers; RF, IF and audio... the radio slang convention for a "transformerless" set is that it doesn't have a power transformer to convert the line AC to high voltage for B+ and low voltage for the tube heaters. Instead, the tube heaters are wired in series and the B+ is rectified directly from the line voltage. Otherwise these sets have all of the other transformers.

9/23/2013 10:13:55 AMRichard Dale Brown

Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
:

9/23/2013 2:07:41 PM*** Edd ***

Sir William . . . . .

Should you be forthcoming with further info, we could be more exacting in our assistance.

To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.

Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.

Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.

Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?

Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?

Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate

tone positions for both radio and phono.

BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.

Standing by . . . .

Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !

73's de Edd

I wonder how the Romans managed to remember their phone number?

::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
::Thank you.
:
:Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
::
:
:

9/23/2013 5:35:27 PMRichard Dale Brown

:
:
:

:
:
:Just found the schematic on Radio museum I'll check ahead next time.RDB:
:
:

:
:
:
:
:
:
:
:Sir William . . . . .
:
:
:
:
:
:
:Should you be forthcoming with further info, we could be more exacting in our assistance.
:
:
:To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
:
:
:Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
:
:
:Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
:
:
:
:
:
:
:
:
:
:
:

:
:
:
:
:
:
:
:
:
:
:Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
:
:
:Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
:
:
:Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
:
:tone positions for both radio and phono.
:
:
:
:BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
:
:
:
:Standing by . . . .
:
:
:
:
:
:
:Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
:
:
:73's de Edd
:
:
:
:
:
:
: I wonder how the Romans managed to remember their phone number?
:
:
:
:
:
:
:

:
:
:
:
:
:
:::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
:::Thank you.
::
::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
:::
::
::
:
:

9/23/2013 7:42:45 PMWilliam

I am not progressing with this radio at all. I have lost all plate voltage...reading on all plates...negative 6 volts....strange..Plus the AC reading on the filaments of the rectifier tube...35z5..is only 13 volts...Although I'm getting continuity between pins 2 and 7, I'm assuming this tube is probably shot. I will search and see if I have another tomorrow.

::
::
::

::
::
::Just found the schematic on Radio museum I'll check ahead next time.RDB:
::
::
::
::
::
::
::
::
::
::Sir William . . . . .
::
::
::
::
::
::
::Should you be forthcoming with further info, we could be more exacting in our assistance.
::
::
::To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
::
::
::Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
::
::
::Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
::
::
::Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
::
::
::Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
::
::tone positions for both radio and phono.
::
::
::
::BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
::
::
::
::Standing by . . . .
::
::
::
::
::
::
::Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
::
::
::73's de Edd
::
::
::
::
::
::
:: I wonder how the Romans managed to remember their phone number?
::
::
::
::
::
::
::
::

::
::
::
::
::
::
::::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
::::Thank you.
:::
:::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
::::
:::
:::
::
::
:
:

9/23/2013 7:48:41 PMWilliam

Edd.....The information you have written is correct for this radio....I do have a schematic which I also got from radiomusrum.

:
:

:
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir William . . . . .
:
:
:
:
:
:
:Should you be forthcoming with further info, we could be more exacting in our assistance.
:
:
:To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
:
:
:Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
:
:
:Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
:
:
:Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
:
:
:Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
:
:tone positions for both radio and phono.
:
:
:
:BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
:
:
:
:Standing by . . . .
:
:
:
:
:
:
:Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
:
:
:73's de Edd
:
:
:
:
:
:
: I wonder how the Romans managed to remember their phone number?
:
:
:
:
:
:
:
:

:
:
:
:
:
:
:::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
:::Thank you.
::
::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
:::
::
::
:
:

9/24/2013 10:35:24 AMWilliam

O.K, this is where I am now. Voltages are on 35Z5, 50L6, and 12SQ7. Readings are as follows..AC voltage readings are
35Z5=29v..50L6=52v..12SQ7=13v..6BJ6=6v..12SA7=12v..6BJ6=6v------DC voltage readings are Pin 8(35Z5)=79v..Pin 3(50L6)=62v, Pin 6(12SQ7)=50v. No DC voltages on the other tubes. Everything else seems to be o.k but evidently it isn't. Transformer between 12SQ7 and 6BJ6 seems to be o.k...Any sugestions?

:Edd.....The information you have written is correct for this radio....I do have a schematic which I also got from radiomusrum.
:
:
:
::
::

::
::
::
::
::
::
::
::
::
::
::
::
::
::
::Sir William . . . . .
::
::
::
::
::
::
::Should you be forthcoming with further info, we could be more exacting in our assistance.
::
::
::To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
::
::
::Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
::
::
::Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
::
::
::Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
::
::
::Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
::
::tone positions for both radio and phono.
::
::
::
::BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
::
::
::
::Standing by . . . .
::
::
::
::
::
::
::Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
::
::
::73's de Edd
::
::
::
::
::
::
:: I wonder how the Romans managed to remember their phone number?
::
::
::
::
::
::
::
::

::
::
::
::
::
::
::::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
::::Thank you.
:::
:::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
::::
:::
:::
::
::
:
:

9/24/2013 4:20:06 PMRichard Dale Brown

:O.K, this is where I am now. Voltages are on 35Z5, 50L6, and 12SQ7. Readings are as follows..AC voltage readings are
:35Z5=29v..50L6=52v..12SQ7=13v..6BJ6=6v..12SA7=12v..6BJ6=6v------DC voltage readings are Pin 8(35Z5)=79v..Pin 3(50L6)=62v, Pin 6(12SQ7)=50v. No DC voltages on the other tubes. Everything else seems to be o.k but evidently it isn't. Transformer between 12SQ7 and 6BJ6 seems to be o.k...Any sugestions?
:
:
::Edd.....The information you have written is correct for this radio....I do have a schematic which I also got from radiomusrum.
::
Are the AC readings you describe for the filaments? If so that adds up to line voltage. Are the dial lights working?
Check the filter capacitors would be best to replace them. Make sure the rectifier tube is good.
If the selector switch is in the phono in position voltage is removed from the rf 6BJ6 and converter 6SA7 and the IF tube 6BJ6 . Check the selector switch and make sure it works correct ally.

::
:::
:::

:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir William . . . . .
:::
:::
:::
:::
:::
:::
:::Should you be forthcoming with further info, we could be more exacting in our assistance.
:::
:::
:::To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
:::
:::
:::Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
:::
:::
:::Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
:::
:::
:::Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
:::
:::
:::Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
:::
:::tone positions for both radio and phono.
:::
:::
:::
:::BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
:::
:::
:::
:::Standing by . . . .
:::
:::
:::
:::
:::
:::
:::Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
::: I wonder how the Romans managed to remember their phone number?
:::
:::
:::
:::
:::
:::
:::
:::

:::
:::
:::
:::
:::
:::
:::::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
:::::Thank you.
::::
::::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
:::::
::::
::::
:::
:::
::
::
:
:

9/24/2013 7:14:30 PMWilliam

Yes, the AC readings are for the filaments, the dial lights are working, and I have replaced the filter capacitors. Plus, I replaced the rectifier tube in case it was faulty.
I'm also getting some strange readings which I noted today. I am taking my voltage readings with the negative point being where No. 8 pin (12SQ7) connects to the switch. From this point I am receiving a positive voltage reading from the negatives of the filter capacitors which are connected to the can of the original electrolytics...66 volts. Also I'm getting a reading from the terminal on the back of the volume control...54 volts. The cathodes of the two 6BJ6 tubes and the 12SA7 tube are also reading voltages...66v but no plate voltage. May some of these readings are o.k.?
The switch is in the first position...ie one position to the right of off.
I trust I haven't confused anyone with my rambling.

::O.K, this is where I am now. Voltages are on 35Z5, 50L6, and 12SQ7. Readings are as follows..AC voltage readings are
::35Z5=29v..50L6=52v..12SQ7=13v..6BJ6=6v..12SA7=12v..6BJ6=6v------DC voltage readings are Pin 8(35Z5)=79v..Pin 3(50L6)=62v, Pin 6(12SQ7)=50v. No DC voltages on the other tubes. Everything else seems to be o.k but evidently it isn't. Transformer between 12SQ7 and 6BJ6 seems to be o.k...Any sugestions?
::
::
:::Edd.....The information you have written is correct for this radio....I do have a schematic which I also got from radiomusrum.
:::
:Are the AC readings you describe for the filaments? If so that adds up to line voltage. Are the dial lights working?
:Check the filter capacitors would be best to replace them. Make sure the rectifier tube is good.
:If the selector switch is in the phono in position voltage is removed from the rf 6BJ6 and converter 6SA7 and the IF tube 6BJ6 . Check the selector switch and make sure it works correct ally.
:
:::
::::
::::

::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::Sir William . . . . .
::::
::::
::::
::::
::::
::::
::::Should you be forthcoming with further info, we could be more exacting in our assistance.
::::
::::
::::To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
::::
::::
::::Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
::::
::::
::::Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
::::
::::
::::Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
::::
::::
::::Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
::::
::::tone positions for both radio and phono.
::::
::::
::::
::::BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
::::
::::
::::
::::Standing by . . . .
::::
::::
::::
::::
::::
::::
::::Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
::::
::::
::::73's de Edd
::::
::::
::::
::::
::::
::::
:::: I wonder how the Romans managed to remember their phone number?
::::
::::
::::
::::
::::
::::
::::
::::

::::
::::
::::
::::
::::
::::
::::::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
::::::Thank you.
:::::
:::::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
::::::
:::::
:::::
::::
::::
:::
:::
::
::
:
:

9/24/2013 9:48:54 PMRichard Dale Brown

:Yes, the AC readings are for the filaments, the dial lights are working, and I have replaced the filter capacitors. Plus, I replaced the rectifier tube in case it was faulty.
:I'm also getting some strange readings which I noted today. I am taking my voltage readings with the negative point being where No. 8 pin (12SQ7) connects to the switch. From this point I am receiving a positive voltage reading from the negatives of the filter capacitors which are connected to the can of the original electrolytics...66 volts. Also I'm getting a reading from the terminal on the back of the volume control...54 volts. The cathodes of the two 6BJ6 tubes and the 12SA7 tube are also reading voltages...66v but no plate voltage. May some of these readings are o.k.?
:The switch is in the first position...ie one position to the right of off.
:I trust I haven't confused anyone with my rambling.

Pin no. 8 0n the 12SQ7 should be chassis ground but could also be on one of the grounded terminals of the rear switch deck that is also common gnd. All the neg. sections of the old filter that you replaced should have been at chassis ground, if the neg. lead of the caps are at gnd. you should get zero volts at that point. If the caps you replaced don't have their neg lead at chassis gnd. You may get a odd reading. Double check. The vol. control has five terminals ,not sure what term. you get the 54 volts on. Bottom line: seems the filter caps neg are not getting a good gnd. Double check. RDB

:::O.K, this is where I am now. Voltages are on 35Z5, 50L6, and 12SQ7. Readings are as follows..AC voltage readings are
:::35Z5=29v..50L6=52v..12SQ7=13v..6BJ6=6v..12SA7=12v..6BJ6=6v------DC voltage readings are Pin 8(35Z5)=79v..Pin 3(50L6)=62v, Pin 6(12SQ7)=50v. No DC voltages on the other tubes. Everything else seems to be o.k but evidently it isn't. Transformer between 12SQ7 and 6BJ6 seems to be o.k...Any sugestions?
:::
:::
::::Edd.....The information you have written is correct for this radio....I do have a schematic which I also got from radiomusrum.
::::
::Are the AC readings you describe for the filaments? If so that adds up to line voltage. Are the dial lights working?
::Check the filter capacitors would be best to replace them. Make sure the rectifier tube is good.
::If the selector switch is in the phono in position voltage is removed from the rf 6BJ6 and converter 6SA7 and the IF tube 6BJ6 . Check the selector switch and make sure it works correct ally.
::
::::
:::::
:::::

:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::Sir William . . . . .
:::::
:::::
:::::
:::::
:::::
:::::
:::::Should you be forthcoming with further info, we could be more exacting in our assistance.
:::::
:::::
:::::To wit . . . your X600 RCA model designator is indicative of it being a Montreal Canadian manufactured unit.
:::::
:::::
:::::Its ID badge is riveted on the center back cover of the set, with its " RCA Victor Company Ltd. " should confirm that.
:::::
:::::
:::::Of the two pics shown below, it should be of the more subdued "Bullhorn" speaker grille design.
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
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:::::Also confirm if it is using (2) 6JB6 tubes in its 6 tube complement ?
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:::::Also, if it is using a 3 section tuning condenser instead of the common 2 section unit ?
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:::::Does it have TWO knobs on its left cabinet side, if using two, the rear one is the radio-phono switch with 3 separate
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:::::tone positions for both radio and phono.
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:::::BUT, if its being in any of the 3 phono positions, that function switch CHOPS OFF the B+ supply to the IF amplifier stage.
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:::::Standing by . . . .
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:::::Pee Ess . . . that potentially can be one FINE sounding (larger than normal speaker ) and performing (frontal RF stage) radio !
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:::::73's de Edd
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::::: I wonder how the Romans managed to remember their phone number?
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:::::::I'm receiving normal voltage on the rect, output, and Det./Af/AVC tubes but zero on the other tubes Filament readings are all normal....This is a RCA Victor, Model x600 radio....I could use some help.
:::::::Thank you.
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::::::Go to Nostalgia resources; look up Jewel radio mod no. 956U. That is a typical no power transformer ac-dc radio. Locatet the tubes with no plate voltages: follow from plate to the rec. tube, when you find the missing voltage that might be where you just passed the defective component.
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