Philco 48-1256 electrolytic voltages - Printable Version

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+--- Thread: Philco 48-1256 electrolytic voltages (/showthread.php?tid=2532)

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Philco 48-1256 electrolytic voltages - retiredinprescott - 08-11-2010

Hi,
I'm working on a Philco 48-1256 radio/phono. Years ago someone replaced all the electrolytics (which then failed) with what looks like whatever they had on hand.
I need to know the voltage specs of the 40MF (C103A) and10MF (C103B). The combined C103 is part number 30-2575-12 but Rider's doesn't give any voltage values for the capacitors in the parts list. Also if possible, the voltage specs for two 15 MF electrolytics (C101 and 102). Schematic is in Rider's 18.
What is in there now is a dual 50MF rated at 150V for C103. Two unreadable electrolytics were put in for C101 and C102. These all come off the 50X6 rectifier tube

Thanks,
Mark

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Re: Philco 48-1256 electrolytic voltages - codefox1 - 08-11-2010

I'd use 250 or 400 volt caps on this one. I normally just use 400 volt ones so I don't have to keep so many different ones in my bins. You can always use a higher voltage cap; the modern ones are so small that you will not have a space issue. Also, going a little higher in value, say a 20 mf to replace a 16 mf or a 10 mf to replace 8 mf is ok too. I don't like to go under the specified value of capacitance by much, to prevent hum and/or motorboating.

Hope this is helpful.

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Re: Philco 48-1256 electrolytic voltages - retiredinprescott - 08-12-2010

Thanks for the help.
The replacement electrolytics that were used in this set seem to be 150V (at least the ones I can read) but that seemed too low to me. I have some 150V modern electrolytics (40 and 10 MF ) but I didn't want to use them without checking on the phorum first. Sounds like I should use higher voltage caps.
Mark

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Re: Philco 48-1256 electrolytic voltages - Ron Ramirez - 08-12-2010

Would you believe the original Philco service manual for the 48-1256 does not give the working voltages for these electrolytics?

So...using the part numbers given and looking them up in the Philco 1950 parts catalog, here is what I found.

C101, C102: 30-2575-11 - 15 uF, 200 WVDC
C103: 30-2575-12 - 40 & 10 uF, 200 & 200 WVDC

I would use caps rated at 250 VDC. You probably won't find 15 or 40 uF; use 22 for the 15 and 47 for the 40 and you'll be OK.

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Re: Philco 48-1256 electrolytic voltages - retiredinprescott - 08-12-2010

Thank you very much for the valuable information. I appreciate it and will do as suggested.
Regards,
Mark

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