12/12/2009 11:42:30 PMThomas Dermody(82261:0)
Curious to know if anyone here has the schematic for a Magnavox chassis 51-03. Mine is the 51-03AA, to be exact.
Thanks,
T.
12/13/2009 9:46:56 AMNostalgia Air(82271:82261)
:Curious to know if anyone here has the schematic for a Magnavox chassis 51-03. Mine is the 51-03AA, to be exact.
That's in Sam's Photofact 421-10, circa 1958. I checked and don't have that one, my 'newer' photofacts are sparse compared to the early ones.
Maybe someone else has it and can scan it?
Richard
12/13/2009 11:03:41 AMPaul Knaack(82272:82261)
:Curious to know if anyone here has the schematic for a Magnavox chassis 51-03. Mine is the 51-03AA, to be exact.
:
:Thanks,
:Hi Thomas, I've scanned it for you, let me know where you would like it sent. Paul
:T.
:
12/13/2009 1:50:52 PMNostalgia Air(82274:82261)
12/13/2009 5:55:19 PMThomas Dermody(82282:82274)
Thank you very much! This is a big help. However, I also need the schematic. I'm trying to fix this set for a friend. Aside from replacing paper capacitors, and a few bad electrolytics (including one that tested perfectly, but leaked physically, and upon replacement the AM stopped random oscillation), I've replaced the silver mica caps in one AM IF. All of the other IF transformers, both AM and FM, test out fine as far as I can tell. No shorts at least, and capacitances test out favorably and consistently. However, FM is weak and not at all selective (only 5 very broad stations are received), and AM blasts and distorts. The AGC/AVC circuit doesn't work for either band, and the eye tube won't deflect at all. ...So a schematic would really help, since it's difficult to follow both sides of the circuit board, and to unsolder IF transformers from the board. Resistance in the main part of the AGC circuit tests out rather low. It feeds both the AM and FM bands, so I'm trying to figure out if everything should be that way, or if something's loading something else down. Resistors seem to test on value, and like I said, I can't seem to locate any shorts in any of the IF transformers associated with the AGC circuit, etc.
Thanks again!
T.
12/13/2009 6:30:18 PMPaul Knaack(82285:82282)
:Thank you very much! This is a big help. However, I also need the schematic. I'm trying to fix this set for a friend. Aside from replacing paper capacitors, and a few bad electrolytics (including one that tested perfectly, but leaked physically, and upon replacement the AM stopped random oscillation), I've replaced the silver mica caps in one AM IF. All of the other IF transformers, both AM and FM, test out fine as far as I can tell. No shorts at least, and capacitances test out favorably and consistently. However, FM is weak and not at all selective (only 5 very broad stations are received), and AM blasts and distorts. The AGC/AVC circuit doesn't work for either band, and the eye tube won't deflect at all. ...So a schematic would really help, since it's difficult to follow both sides of the circuit board, and to unsolder IF transformers from the board. Resistance in the main part of the AGC circuit tests out rather low. It feeds both the AM and FM bands, so I'm trying to figure out if everything should be that way, or if something's loading something else down. Resistors seem to test on value, and like I said, I can't seem to locate any shorts in any of the IF transformers associated with the AGC circuit, etc.
:
:Thanks again!
:
:T.
:Hi Thomas, There are four more pages that Richard did not post. If you send me an email or address I will forward them to you. Paul
12/13/2009 6:41:29 PMThomas Dermody(82286:82285)
Thank you! You can send it to the address I have entered for this particular post.
T.
12/13/2009 8:48:31 PMThomas Dermody(82294:82286)
Nice! This is one of those Magnavox receivers with the 10KC filter in the output of the AM section. I can't wait to hear what that sounds like once the radio functions properly. Regarding the AM section, I wonder if I have the diode in backwards, since it just fits into two clips at the top of the output IF transformer. That would certainly keep the AVC circuit from functioning.
T.
12/13/2009 10:10:04 PMNostalgia Air(82298:82285)
