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 Post subject: Philco 51-1731 Restoration
PostPosted: Jan Mon 29, 2018 4:42 am 
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Joined: Dec Fri 13, 2013 10:23 pm
Posts: 12
Hey all, I have an old Philco model 51-1731 that I'm working on. It currently doesn't turn on at all, and the turntable is broken. I'm hoping a tube or two will fix the first issue. The turntable is on slides so it can pull out, which I'm going to try to keep, and I'd appreciate some guidance on something to replace it with.

Here's the service manual for reference.


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 Post subject: Re: Philco 51-1731 Restoration
PostPosted: Jan Mon 29, 2018 8:55 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12413
Location: San Jose, CA USA
The radio chassis needs its electrolytic and paper capacitors replaced as well as checking the tubes. See here for advice on how to go about that: https://www.antiqueradio.org/begin.htm

What is broken on the turntable? It may be repairable.

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Tom K6VL


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 Post subject: Re: Philco 51-1731 Restoration
PostPosted: Feb Thu 01, 2018 10:10 pm 
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Joined: Dec Fri 13, 2013 10:23 pm
Posts: 12
The tone arm is broken and the spindle is bent, as shown in the last photo. I'll pull the chassis and locate the caps before buying tubes, and thanks for the guidance.


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 Post subject: Re: Philco 51-1731 Restoration
PostPosted: Feb Thu 01, 2018 11:38 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12413
Location: San Jose, CA USA
The spindle might be OK -- they are made with a bent shape like that. But indeed, your tone arm looks a bit distressed! You may be able to find a replacement tone arm or the whole record changer assembly if you place a want ad in the classified section here.

Did you take a stab at replacing capacitors yet? Tubes are often still good, so you may not need to buy any replacements for those.

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Tom K6VL


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 Post subject: Re: Philco 51-1731 Restoration
PostPosted: Feb Fri 02, 2018 12:32 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Philco 51-1731 high-resolution scans.

21-72 Specifications.
http://americanradiohistory.com/hd2/IDX ... e-0073.pdf

21-73 AM Alignment.
http://americanradiohistory.com/hd2/IDX ... e-0074.pdf

21-74 FM Alignment.
http://americanradiohistory.com/hd2/IDX ... e-0075.pdf

21-75 Parts list.
http://americanradiohistory.com/hd2/IDX ... e-0076.pdf

21-76 Parts list. (Cont).
http://americanradiohistory.com/hd2/IDX ... e-0077.pdf

21-77 and 21-78 Double page schematic.
http://americanradiohistory.com/hd2/IDX ... e-0078.pdf

The changer is model M22

Image

M22 Teardown photos: http://www.pbase.com/dennygraham/philco

https://d2ydh70d4b5xgv.cloudfront.net/i ... 8ed000.jpg

If you plan to work on the changer, it might be best to ask for advice on the phonographs forum.
Philco and Sams both published service manuals for M22
some cartridge info here viewtopic.php?p=800596#p800596

Greg.


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 Post subject: Re: Philco 51-1731 Restoration
PostPosted: Feb Fri 09, 2018 3:03 pm 
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Joined: Apr Thu 13, 2017 11:22 pm
Posts: 47
Location: Cleveland, Ohio 44102
i just finished a unit exactly like this. took me 3 months. The phonograph is a real bear. you can get the belt and drive wheel and needle. the crystal cartridge on the other hand, I'm still looking, pray yours is good. Forget the Sam's Photofact for this set, it is useless. the Philco manual is golden. Steve Johnson schematics has it. sorry i don't have the link.
As for the radio, there are several capacitors that YOU CANNOT REPLACE. you will mess up your whole world. they look like resistors, but they are in fact capacitors. Also, there are wire wound caps, wax coated. Do Not change those either. Do replace the wax paper caps and the black caps with multiple stripes and the filter caps.
Also put some machine oil down the holes top and bottom of all your IF transformers several times to loosen them up. The cores on these are made of fired clay and have a straight slot in them. They seize up, and when you try to align, they break. its a nightmare.
Feel free to message me if you are going to tackle this radio and have questions. i just delivered it last week and it is pretty fresh in my little brain.


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