It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
Any thoughts? Thanks in advance!!!! -Bob S
Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there. |
:Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
:
:It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:
:So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
:
:I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
:
:There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:
:So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
:
:Any thoughts? Thanks in advance!!!! -Bob S
:
Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
R21A was 647k, just replaced with exact replacement 470k.
R21B was 521k, also replaced w/shiny new 470k.
R22 was 307.5K which I suppose is within a reasonable margin of error?
Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
As always your assistance is GREATLY appreciated.
-Bob Ssss
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bob Essssss. . . . .
:
:
:
:
:
:
:
:
:Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:
:
:
:The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
:
:
:
:
:So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
:
:
:
:
:Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:
:
:Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
:
:
:Great shades of Deja vu of times past . . . and not too long ago, either !
:
:
:How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
:
:
:My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
:
:
:
:Additionally confirm measured resistance values of:
:
:
:Load resistor R21
:
:
:Plate resistor R22
:
:
:1st grid resistor R20
:
:
:AF out 1st grid resistor R21B
:
:
:And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
:
:
:Capacitor line item 9 is also suspect for leakage.
:
:
:
:PARTE DEUX:
:
:
:
:
:
:The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:
:
:
:That would be the input for an external antenna if being used.
:
:
:
:
:
:Standing by . . .
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
:
:
::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
::
::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::
::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
::
::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
::
::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::
::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
::
::Any thoughts? Thanks in advance!!!! -Bob S
::
:
|
:: ::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:Señor 73 73 73 de Edd...
:
:Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
:
:Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
:
:R21A was 647k, just replaced with exact replacement 470k.
:
:R21B was 521k, also replaced w/shiny new 470k.
:
:R22 was 307.5K which I suppose is within a reasonable margin of error?
:
:Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
:
:For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
:
:Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
:
:What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
:
:Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
:
:So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
:
:As always your assistance is GREATLY appreciated.
:
:-Bob Ssss
:
:
::
::
::
::
::
::
::
::
::Sir Bob Essssss. . . . .
::
::
::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
::
::
::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
::
::
::
::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
::
::Great shades of Deja vu of times past . . . and not too long ago, either !
::
::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
::
::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
::
::Additionally confirm measured resistance values of:
::Load resistor R21
::
::Plate resistor R22
::
::1st grid resistor R20
::
::AF out 1st grid resistor R21B
::
::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
::
::Capacitor line item 9 is also suspect for leakage.
::
::PARTE DEUX:
::
::
::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::
::
::That would be the input for an external antenna if being used.
::
::Standing by . . .
::
::73's de Edd
::
::
::
::
::
::
:::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
:::
:::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:::
:::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
:::
:::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
:::
:::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::
:::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
:::
:::Any thoughts? Thanks in advance!!!! -Bob S
:::
::
:
Doing some homework, Im finding that a 4' lead connected to Grid 1 on 6A7 directly or to antenna lead just makes what reception I do have a little "staticky".. I get better results just waving my hand over the radio very close...
Checking our oscillator coil, it would appear that between terminals 3 and 4, we are measuring 7.9 ohms, between 1 and 2, 3.7 ohms. No smoking gun.
Grid 5 on the 6A7 to chassis ground produced a -3.9V.
Right where you wanted it. So... next step is the oscillator output you mentioned?
Standing by for your thoughts.. Thanks as always!
Bob Ssss
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bob Esssss . . . . .
:
:
:AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
:
:
:Now, that do make matters mo' different.
:
:
:Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
:
:
:Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
:
:
:And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
:
:
:If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
:
:
:The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
:
:
:Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
:
:
:Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
:
:
:Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
:
:
:Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
:
:
:With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
:
:
:There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
:
:
:The highest reading being achieved with a VTVM or modern DVM.
:
:
:If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
:
:
::Señor 73 73 73 de Edd...
::
::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
::
::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
::
::R21A was 647k, just replaced with exact replacement 470k.
::
::R21B was 521k, also replaced w/shiny new 470k.
::
::R22 was 307.5K which I suppose is within a reasonable margin of error?
::
::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
::
::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
::
::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
::
::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
::
::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
::
::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
::
::As always your assistance is GREATLY appreciated.
::
::-Bob Ssss
::
:
::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Bob Essssss. . . . .
:::
:
:::
:::
:::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:
:
:::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
:::
:::
:::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
:::
:::
:
:::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:::
:::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
:::
:::Great shades of Deja vu of times past . . . and not too long ago, either !
:::
:::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
:::
:::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
:::
:::Additionally confirm measured resistance values of:
:::Load resistor R21
:::
:::Plate resistor R22
:::
:::1st grid resistor R20
:::
:::AF out 1st grid resistor R21B
:::
:::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
:::
:::Capacitor line item 9 is also suspect for leakage.
:::
:::PARTE DEUX:
:::
:::
:::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::
:::
:::That would be the input for an external antenna if being used.
:::
:::Standing by . . .
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
::::
::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::::
::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
::::
::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
::::
::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::
::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
::::
::::Any thoughts? Thanks in advance!!!! -Bob S
::::
:::
::
:
After my previous post, and thinking about your next step AND something you wrote to someone else that I read during the SEARCH of the forum, I thought about the alignment and where I THOUGHT you were going with the next step.
So I used the procedure I learned from my trusty "Bret Menassa's Old Radios" DVD and took a stab at alignment. I was able to get the volume to improve significantly... while I still think it's on the low side, it's better. So I thought I should update you and maybe that will help out...
Still curious about your next step but I wanted to make sure you knew exactly where we are as of NOW.
THANKS again. -Bob Ssss
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bob Esssss . . . . .
:
:
:AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
:
:
:Now, that do make matters mo' different.
:
:
:Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
:
:
:Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
:
:
:And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
:
:
:If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
:
:
:The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
:
:
:Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
:
:
:Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
:
:
:Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
:
:
:Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
:
:
:With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
:
:
:There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
:
:
:The highest reading being achieved with a VTVM or modern DVM.
:
:
:If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
:
:
::Señor 73 73 73 de Edd...
::
::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
::
::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
::
::R21A was 647k, just replaced with exact replacement 470k.
::
::R21B was 521k, also replaced w/shiny new 470k.
::
::R22 was 307.5K which I suppose is within a reasonable margin of error?
::
::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
::
::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
::
::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
::
::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
::
::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
::
::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
::
::As always your assistance is GREATLY appreciated.
::
::-Bob Ssss
::
:
::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Bob Essssss. . . . .
:::
:
:::
:::
:::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:
:
:::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
:::
:::
:::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
:::
:::
:
:::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:::
:::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
:::
:::Great shades of Deja vu of times past . . . and not too long ago, either !
:::
:::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
:::
:::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
:::
:::Additionally confirm measured resistance values of:
:::Load resistor R21
:::
:::Plate resistor R22
:::
:::1st grid resistor R20
:::
:::AF out 1st grid resistor R21B
:::
:::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
:::
:::Capacitor line item 9 is also suspect for leakage.
:::
:::PARTE DEUX:
:::
:::
:::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::
:::
:::That would be the input for an external antenna if being used.
:::
:::Standing by . . .
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
::::
::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::::
::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
::::
::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
::::
::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::
::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
::::
::::Any thoughts? Thanks in advance!!!! -Bob S
::::
:::
::
:
|
:Sr. Edd,
:
:After my previous post, and thinking about your next step AND something you wrote to someone else that I read during the SEARCH of the forum, I thought about the alignment and where I THOUGHT you were going with the next step.
:
:So I used the procedure I learned from my trusty "Bret Menassa's Old Radios" DVD and took a stab at alignment. I was able to get the volume to improve significantly... while I still think it's on the low side, it's better. So I thought I should update you and maybe that will help out...
:
:Still curious about your next step but I wanted to make sure you knew exactly where we are as of NOW.
:
:THANKS again. -Bob Ssss
:
::
::
::
::
::
::
::
::
::
::
::
::
::
::Sir Bob Esssss . . . . .
::
::
::AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
::
::
::Now, that do make matters mo' different.
::
::
::Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
::
::
::Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
::
::
::And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
::
::
::If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
::
::
::The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
::
::
::Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
::
::
::Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
::
::
::Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
::
::
::Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
::
::
::With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
::
::
::There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
::
::
::The highest reading being achieved with a VTVM or modern DVM.
::
::
::If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
::
::
::
::
::
::
::
::73's de Edd
::
::
::
::
::
::
::
::
::
::
::
::
::
:::Señor 73 73 73 de Edd...
:::
:::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
:::
:::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
:::
:::R21A was 647k, just replaced with exact replacement 470k.
:::
:::R21B was 521k, also replaced w/shiny new 470k.
:::
:::R22 was 307.5K which I suppose is within a reasonable margin of error?
:::
:::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
:::
:::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
:::
:::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
:::
:::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
:::
:::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
:::
:::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
:::
:::As always your assistance is GREATLY appreciated.
:::
:::-Bob Ssss
:::
::
:::
::::
::::
::::
::::
::::
::::
::::
::::
::::Sir Bob Essssss. . . . .
::::
::
::::
::::
::::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::
::
::::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
::::
::::
::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
::::
::::
::
::::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
::::
::::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
::::
::::Great shades of Deja vu of times past . . . and not too long ago, either !
::::
::::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
::::
::::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
::::
::::Additionally confirm measured resistance values of:
::::Load resistor R21
::::
::::Plate resistor R22
::::
::::1st grid resistor R20
::::
::::AF out 1st grid resistor R21B
::::
::::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
::::
::::Capacitor line item 9 is also suspect for leakage.
::::
::::PARTE DEUX:
::::
::::
::::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::
::::
::::That would be the input for an external antenna if being used.
::::
::::Standing by . . .
::::
::::73's de Edd
::::
::::
::::
::::
::::
::::
:::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
:::::
:::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:::::
:::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
:::::
:::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
:::::
:::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::::
:::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
:::::
:::::Any thoughts? Thanks in advance!!!! -Bob S
:::::
::::
:::
::
:
Okay so first I tried to measure resistance between pin 3 for tube 75 and grid 1 of 6A7, it read 470k ohms. I looked at the wiring diagram and it appears that someone reversed pin 3 and 4... I double and triple checked it and they were backwards. So I fixed that, and now from pin 3, tube 75 to grid 1 of 6A7 gives resistance of 1.1 ohms.
Turning on the radio, the sound was exactly the same, no better, no worse.
Antenna test seems to strenghten the sound quality and volume and I add more and more fingers and tension on the antenna coil.
But I wasn't sure exactly what the next step was...
I was able to find a station fairly strong around 13KC and using the two adjusting screws near the tuning condensors, I was able to tune it in a little better. I can still only pick up the two strongest stations, the others lower down the dial I can hear if I turn the volume to 100% and put my ear up to the speaker...
Is this just a matter of these tuning adjustments?
I suppose it's possible that someone already tried to "fix" it by touching the adjustments?
Whatcha think? Thanks Edd! -Bob
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bob Sssssssss. . . . . .
:
:
:Fine so far on your findings and with the confirming of the oscillator section of the converter working.
:
:
:Also with that small tack on aerial not enhancing the reception, that would give some degree of confirmation of integrity on the loop antenna . . BUT . . lets positively confirm by the checking of the whole loop and its AVC circuitry tie in by an ohmming out from pin 3 of the #75 tube to the grid cap atop the 6A7 toobie. That inductance would be the RF input equivalency of the 3-4 terminal of the oscillator coil reading, but its being made with much heavier gauge wire, so possibly expect in the ~" tennish " ohms range.
:
:
:(Basically, we just don't want to find an open circuit in that tested circuitry loop.)
:
:
:If that is an intact winding, now, on with our getting down to the subtle clue that has been continually presenting itself to you.
:
:
:
:de loop . . . . BOSS . . . DE LOOP . . . . now, if you will tune right onto a receivable station and have it playing for you, then grip the winding cluster of the loop antennna and see if the reception is enhanced or debased as you then increase your grip with the pressing of the fingers ever more firmly into the loop.
:
:
:Now if you are rewarded with an enhancement of the reception of that station, using that procedure, that will clue you in as the need for need of a more optimal tuning of the RF section of the tuning condensers . . . companion . . trimmer item 17-1, so run the tuning condenser up to a weak station near 1400-1500 Khz . . . how-some-ever . . . if that is not possible, by your receiving NOTHING up there, then work with the highest frequency station that you are able to pick up.
:
:
:Now . . . after peaking trimmer 17-1 . . .has the station reception increased a quantum in performance ?
:
:
:
:
:
:Standing by . . . to see . . . whassssuuuuppppp ?
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
::Sr. Edd,
::
::After my previous post, and thinking about your next step AND something you wrote to someone else that I read during the SEARCH of the forum, I thought about the alignment and where I THOUGHT you were going with the next step.
::
::So I used the procedure I learned from my trusty "Bret Menassa's Old Radios" DVD and took a stab at alignment. I was able to get the volume to improve significantly... while I still think it's on the low side, it's better. So I thought I should update you and maybe that will help out...
::
::Still curious about your next step but I wanted to make sure you knew exactly where we are as of NOW.
::
::THANKS again. -Bob Ssss
::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Bob Esssss . . . . .
:::
:::
:::AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
:::
:::
:::Now, that do make matters mo' different.
:::
:::
:::Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
:::
:::
:::Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
:::
:::
:::And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
:::
:::
:::If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
:::
:::
:::The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
:::
:::
:::Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
:::
:::
:::Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
:::
:::
:::Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
:::
:::
:::Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
:::
:::
:::With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
:::
:::
:::There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
:::
:::
:::The highest reading being achieved with a VTVM or modern DVM.
:::
:::
:::If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
:::
:::
:::
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::::Señor 73 73 73 de Edd...
::::
::::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
::::
::::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
::::
::::R21A was 647k, just replaced with exact replacement 470k.
::::
::::R21B was 521k, also replaced w/shiny new 470k.
::::
::::R22 was 307.5K which I suppose is within a reasonable margin of error?
::::
::::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
::::
::::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
::::
::::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
::::
::::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
::::
::::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
::::
::::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
::::
::::As always your assistance is GREATLY appreciated.
::::
::::-Bob Ssss
::::
:::
::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::Sir Bob Essssss. . . . .
:::::
:::
:::::
:::::
:::::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:::
:::
:::::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
:::::
:::::
:::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
:::::
:::::
:::
:::::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:::::
:::::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
:::::
:::::Great shades of Deja vu of times past . . . and not too long ago, either !
:::::
:::::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
:::::
:::::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
:::::
:::::Additionally confirm measured resistance values of:
:::::Load resistor R21
:::::
:::::Plate resistor R22
:::::
:::::1st grid resistor R20
:::::
:::::AF out 1st grid resistor R21B
:::::
:::::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
:::::
:::::Capacitor line item 9 is also suspect for leakage.
:::::
:::::PARTE DEUX:
:::::
:::::
:::::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::::
:::::
:::::That would be the input for an external antenna if being used.
:::::
:::::Standing by . . .
:::::
:::::73's de Edd
:::::
:::::
:::::
:::::
:::::
:::::
::::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
::::::
::::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::::::
::::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
::::::
::::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
::::::
::::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::::
::::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
::::::
::::::Any thoughts? Thanks in advance!!!! -Bob S
::::::
:::::
::::
:::
::
:
I found that I got the same RECEPTION on both.. the stations I picked up on one, I picked up on the other with equal strength. But when I cranked up the volume on the GE it was LOUD, when I have the Motorola turned all the way up, it equals about 10% volume (estimating) of the GE...
SO Im wondering if Im barking up the wrong tree here.. Is there a resource you know of that I could find what the voltages should be on the different pins of the tubes? I think I may have been leading you in the wrong direction...
The tuning condensor adjustment did seem to maximize the reception and increase the volume a little.. which is what made me drag out the other radio to compare to...
Thanks! --Bob Ssss
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bob Sssssssss. . . . . .
:
:
:Fine so far on your findings and with the confirming of the oscillator section of the converter working.
:
:
:Also with that small tack on aerial not enhancing the reception, that would give some degree of confirmation of integrity on the loop antenna . . BUT . . lets positively confirm by the checking of the whole loop and its AVC circuitry tie in by an ohmming out from pin 3 of the #75 tube to the grid cap atop the 6A7 toobie. That inductance would be the RF input equivalency of the 3-4 terminal of the oscillator coil reading, but its being made with much heavier gauge wire, so possibly expect in the ~" tennish " ohms range.
:
:
:(Basically, we just don't want to find an open circuit in that tested circuitry loop.)
:
:
:If that is an intact winding, now, on with our getting down to the subtle clue that has been continually presenting itself to you.
:
:
:
:de loop . . . . BOSS . . . DE LOOP . . . . now, if you will tune right onto a receivable station and have it playing for you, then grip the winding cluster of the loop antennna and see if the reception is enhanced or debased as you then increase your grip with the pressing of the fingers ever more firmly into the loop.
:
:
:Now if you are rewarded with an enhancement of the reception of that station, using that procedure, that will clue you in as the need for need of a more optimal tuning of the RF section of the tuning condensers . . . companion . . trimmer item 17-1, so run the tuning condenser up to a weak station near 1400-1500 Khz . . . how-some-ever . . . if that is not possible, by your receiving NOTHING up there, then work with the highest frequency station that you are able to pick up.
:
:
:Now . . . after peaking trimmer 17-1 . . .has the station reception increased a quantum in performance ?
:
:
:
:
:
:Standing by . . . to see . . . whassssuuuuppppp ?
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
::Sr. Edd,
::
::After my previous post, and thinking about your next step AND something you wrote to someone else that I read during the SEARCH of the forum, I thought about the alignment and where I THOUGHT you were going with the next step.
::
::So I used the procedure I learned from my trusty "Bret Menassa's Old Radios" DVD and took a stab at alignment. I was able to get the volume to improve significantly... while I still think it's on the low side, it's better. So I thought I should update you and maybe that will help out...
::
::Still curious about your next step but I wanted to make sure you knew exactly where we are as of NOW.
::
::THANKS again. -Bob Ssss
::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Bob Esssss . . . . .
:::
:::
:::AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
:::
:::
:::Now, that do make matters mo' different.
:::
:::
:::Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
:::
:::
:::Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
:::
:::
:::And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
:::
:::
:::If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
:::
:::
:::The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
:::
:::
:::Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
:::
:::
:::Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
:::
:::
:::Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
:::
:::
:::Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
:::
:::
:::With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
:::
:::
:::There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
:::
:::
:::The highest reading being achieved with a VTVM or modern DVM.
:::
:::
:::If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
:::
:::
:::
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::::Señor 73 73 73 de Edd...
::::
::::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
::::
::::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
::::
::::R21A was 647k, just replaced with exact replacement 470k.
::::
::::R21B was 521k, also replaced w/shiny new 470k.
::::
::::R22 was 307.5K which I suppose is within a reasonable margin of error?
::::
::::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
::::
::::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
::::
::::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
::::
::::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
::::
::::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
::::
::::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
::::
::::As always your assistance is GREATLY appreciated.
::::
::::-Bob Ssss
::::
:::
::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::Sir Bob Essssss. . . . .
:::::
:::
:::::
:::::
:::::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:::
:::
:::::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
:::::
:::::
:::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
:::::
:::::
:::
:::::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
:::::
:::::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
:::::
:::::Great shades of Deja vu of times past . . . and not too long ago, either !
:::::
:::::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
:::::
:::::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
:::::
:::::Additionally confirm measured resistance values of:
:::::Load resistor R21
:::::
:::::Plate resistor R22
:::::
:::::1st grid resistor R20
:::::
:::::AF out 1st grid resistor R21B
:::::
:::::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
:::::
:::::Capacitor line item 9 is also suspect for leakage.
:::::
:::::PARTE DEUX:
:::::
:::::
:::::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::::
:::::
:::::That would be the input for an external antenna if being used.
:::::
:::::Standing by . . .
:::::
:::::73's de Edd
:::::
:::::
:::::
:::::
:::::
:::::
::::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
::::::
::::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::::::
::::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
::::::
::::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
::::::
::::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::::
::::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
::::::
::::::Any thoughts? Thanks in advance!!!! -Bob S
::::::
:::::
::::
:::
::
:
|
Hi Edd. This evening I brought out my trusty GE L-640 that you helped me with before... and I put it right next to the Motorola Im working on now. I found that I got the same RECEPTION on both.. the stations I picked up on one, I picked up on the other with equal strength. But when I cranked up the volume on the GE it was LOUD, when I have the Motorola turned all the way up, it equals about 10% volume (estimating) of the GE... SO Im wondering if Im barking up the wrong tree here.. Is there a resource you know of that I could find what the voltages should be on the different pins of the tubes? I think I may have been leading you in the wrong direction... The tuning condensor adjustment did seem to maximize the reception and increase the volume a little.. which is what made me drag out the other radio to compare to... Thanks! --Bob Ssss Sir Bob Sssssssss. . . . . . de loop . . . . BOSS . . . DE LOOP . . . . now, if you will tune right onto a receivable station and have it playing for you, then grip the winding cluster of the loop antennna and see if the reception is enhanced or debased as you then increase your grip with the pressing of the fingers ever more firmly into the loop. Standing by . . . to see . . . whassssuuuuppppp ? 73's de Edd Sr. Edd, After my previous post, and thinking about your next step AND something you wrote to someone else that I read during the SEARCH of the forum, I thought about the alignment and where I THOUGHT you were going with the next step.
Fine so far on your findings and with the confirming of the oscillator section of the converter working.
Also with that small tack on aerial not enhancing the reception, that would give some degree of confirmation of integrity on the loop antenna . . BUT . . lets positively confirm by the checking of the whole loop and its AVC circuitry tie in by an ohmming out from pin 3 of the #75 tube to the grid cap atop the 6A7 toobie. That inductance would be the RF input equivalency of the 3-4 terminal of the oscillator coil reading, but its being made with much heavier gauge wire, so possibly expect in the ~" tennish " ohms range.
(Basically, we just don't want to find an open circuit in that tested circuitry loop.)
If that is an intact winding, now, on with our getting down to the subtle clue that has been continually presenting itself to you.
Now if you are rewarded with an enhancement of the reception of that station, using that procedure, that will clue you in as the need for need of a more optimal tuning of the RF section of the tuning condensers . . . companion . . trimmer item 17-1, so run the tuning condenser up to a weak station near 1400-1500 Khz . . . how-some-ever . . . if that is not possible, by your receiving NOTHING up there, then work with the highest frequency station that you are able to pick up.
Now . . . after peaking trimmer 17-1 . . .has the station reception increased a quantum in performance ?
:::
:::So I used the procedure I learned from my trusty "Bret Menassa's Old Radios" DVD and took a stab at alignment. I was able to get the volume to improve significantly... while I still think it's on the low side, it's better. So I thought I should update you and maybe that will help out...
:::
:::Still curious about your next step but I wanted to make sure you knew exactly where we are as of NOW.
:::
:::THANKS again. -Bob Ssss
:::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::Sir Bob Esssss . . . . .
::::
::::
::::AAAhhhh...sooooo . . . with that comeback . . . on the receiver not actually having a myriad of stations just rolling in . . but that the one or possibly, two stations are just coming in quite weakly.
::::
::::
::::Now, that do make matters mo' different.
::::
::::
::::Lets take a couple of clip leads and string them in series to get about an ~ 4-6 ft vertical antenna ( aerial) and then take the lower loose clip and connect to the easiest access, be it the wire going from the loop antenna to the external top grid cap of the 6A7 or to the stator connection terminal of the RF section of the tuning condenser.
::::
::::
::::Then you want to see if the station(s) reception is better, and if so, does the tuning in to that station(s) seem to be sharp and concise, or is it a bit broad in its capture range and retention of the station ?
::::
::::
::::And that, along with the dial scale logging not being quite in agreement with the received signals, known actual operating frequency.
::::
::::
::::If being the latter condition, and if your other olde tyme AM tubed radios, being used in that locale, seem to readily pick up SEVERAL stations with ease, me thinks that we might have local oscillator problemas.
::::
::::
::::The simplest thing might be for an olde oscillator coil [Item2] to have opened a small gauge, wire connection, right at the terminal of its assigned coil winding.
::::
::::
::::Consult the schematic and notice that there is a major resonant osc coil winding between terminals 3-4 and its resistance might be in the upwards of~ "tennish" ohms.
::::
::::
::::Then there is a minor winding between terminals 1-2 and it just might be in the low " oneish " ohm(s) range.
::::
::::
::::Should either of these be in the thousands or megohms or " openish" range . . .we has done founds the problem . . . and it is not us . . . as Pogo might have perceived.
::::
::::
::::Now if that coil happens to check out "goodish" we need to move on up to the Firstus Gridamus of the 6A7, and use DC metering between its pin #5 and floating chassis ground. Or to clarify that ground connection situation, just meter across item #23, the 47K osc grid resistor, since it connects accordingly.
::::
::::
::::With the set operational and that oscillator section , "ossifrying", there should be a negative voltage creation across that grid resistor of ~ -2.5 volts as a low aspect and upwards of ~-5 volts on an higher activity situation and the voltage will be found to be different at either extremes of the BCB tuning condensers positioning.
::::
::::
::::There being a variance also, in respect of the inherent metering impedance being presented in its loading down of the circuitry, all in accordance to the type of metering medium utilized.
::::
::::
::::The highest reading being achieved with a VTVM or modern DVM.
::::
::::
::::If this has not come up with results, up to that final point, come back with feedback, for a possible procedural, in the listening for the sets oscillator output , when being received on a second nearby radio . . . being the next step in order.
::::
::::
::::
::::
::::
::::
::::
::::73's de Edd
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
:::::Señor 73 73 73 de Edd...
:::::
:::::Yup a little bit of deja vu' but can't you see how much I learned from round #1? This radio is much simpler.. then again I got much further this time.
:::::
:::::Okay for starters, R20 was at 4.27 meg, I got it closer with two resistors in series to 3.55 meg (and double checked it on my meter)
:::::
:::::R21A was 647k, just replaced with exact replacement 470k.
:::::
:::::R21B was 521k, also replaced w/shiny new 470k.
:::::
:::::R22 was 307.5K which I suppose is within a reasonable margin of error?
:::::
:::::Powered back up and no more chirping at max volume, so thats progress. Tuning still the same. When I say sensitive, what I mean is that if you just turn the dial, you can never find a station. You have to turn it ever so slowly and then back and forth and there is one EXACT spot where it will pick up the station.. works for a few local stations, but it's a little tricky to find them. WHen you finally do find it and tune to it, the volume is a whisper but it's clear.
:::::
:::::For example, Im 10 feet away from it right now, the volume is as high as it will go. I can barely hear it from where Im sitting right now. Up close the sound thats coming out is very clear, just low volume.
:::::
:::::Piped in sound was to the center lug of the volume control which did provide volume adjustable sound from the I-Pod out to the speaker at what I would assume was the proper volume level for max? It was not speaker blowing volume but certainly could be heard across the room. Not as loud as that L-640 that we were discussing before.... but should it be?
:::::
:::::What else... .01 paper cap from black/white wire to grid 1 on 75 is like a mute button. All sound stops.
:::::
:::::Cap 13 was replaced by someone else with only ONE cap... a .007 in place of the .01 and the .0005 is/was missing. I don't have one sitting around but I put in a .001 which is the closest I could find, and it took some hiss out of the sound but volume remained the same... Does that sound about what you'd expect from that?
:::::
:::::So.... I feel like Im SO close because even when I hold my hand over the radio the volume perks up a little.... but no cigars YET...
:::::
:::::As always your assistance is GREATLY appreciated.
:::::
:::::-Bob Ssss
:::::
::::
:::::
::::::
::::::
::::::
::::::
::::::
::::::
::::::
::::::
::::::Sir Bob Essssss. . . . .
::::::
::::
::::::
::::::
::::::Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
::::
::::
::::::The only thing ? about that was the injection point of the external audio . . . the top side of the vol control probably, but also a possibility of the center rotor connector.
::::::
::::::
::::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations.
::::::
::::::
::::
::::::Now if you place those two statements together . . . why would one not think that the unit could be working other than properly . . . with the front end operating correctly, to be receiving ALL of the multiple stations with GREAT sensitivity would be indicative of all being well up to the derivation of the detected audio at the white/black wire off from the bottom of the secondary of the 2nd IF transformer.
::::::
::::::Then, the processing of the audio thru the volume control circuitry into the NORMAL operating AF output string from that point on.
::::::
::::::Great shades of Deja vu of times past . . . and not too long ago, either !
::::::
::::::How's about connecting a .01 paper from the white/black wire to the 1st grid of the 75 and have the volume control at max to see what happens.
::::::
::::::My other thought might be, was that you possibly was putting one HEFTY external audio signal into the systen, so the present actual gain of the AF output stages might really not be as GREAT as is perceived ?
::::::
::::::Additionally confirm measured resistance values of:
::::::Load resistor R21
::::::
::::::Plate resistor R22
::::::
::::::1st grid resistor R20
::::::
::::::AF out 1st grid resistor R21B
::::::
::::::And did that item 13 tandem capacitor get replaced with a 500 uufd unit going from 75 plate to ground and another separate .01 cap going from plate of 75 to 1st grid of AF output tube ?
::::::
::::::Capacitor line item 9 is also suspect for leakage.
::::::
::::::PARTE DEUX:
::::::
::::::
::::::The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
::::::
::::::
::::::That would be the input for an external antenna if being used.
::::::
::::::Standing by . . .
::::::
::::::73's de Edd
::::::
::::::
::::::
::::::
::::::
::::::
:::::::Hi. I have a problem that I can't seem to figure out... Im hoping someone has a thought for me...
:::::::
:::::::It's a Motorola 63E Model. When I got it, it did NOTHING. Replaced electrolytic caps, still nada. Traced that problem down to a break in the ballast resistor. Replaced that and got power. No sound. Replaced all paper caps, still nothing. All tubes were glowing but I pulled them all and one was the wrong one. Replaced that with correct one and nothing still. Buzz test created sound at the speaker until (working backwards) I got to 6A7. Replaced 6A7 with known good tube and now get buzz variable by volume control back to the first grid of 6A7... Just to make sure I piped in sound to the volume control and get perfect sound to the speaker from there.
:::::::
:::::::So now I am able to tune into stations but it is SUPER sensitive and the volume is very low even on the strongest stations. Also when I turn the volume all the way up, I get a chirping...
:::::::
:::::::I did tune into my strongest station and gently adjust the alignment screws which made it a little better. Also turning the radio on the table or holding my hand just above the antenna makes it louder. So Im thinking that I have a problem with the antenna?
:::::::
:::::::There are two loops in the antenna and an electrostatic shield. I do get continuity on both loops of the antenna and both electrostatic shields are in place and grounded as per the schematic. One loop goes from grid 1 of 6A7 around and terminates at white/green wire and .05 cap as shown on the schematic. The other goes to ground on one end (thru a .002 cap) and other end goes basically no where, soldiered to a eyehole on the antenna assembly but it appears nothing is supposed to attach to that per the schematic.
:::::::
:::::::So basically I THOUGHT I had everything right but I must be missing something... Or maybe I'm looking under the wrong rock for my problem...
:::::::
:::::::Any thoughts? Thanks in advance!!!! -Bob S
:::::::
::::::
:::::
::::
:::
::
: