deciphering Philco Potentiometer numbers - Printable Version

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+--- Thread: deciphering Philco Potentiometer numbers (/showthread.php?tid=14280)

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deciphering Philco Potentiometer numbers - keith49vj3 - 03-24-2016

All, I'm working on a Philco that has a flex shaft potentiometer.  Written in blue ink on the side of the pot is "4248 PHILCO 885072".  I measure this pot at 1.25M but according to the schematic it should be a 350K.  Can anyone decipher these numbers?  I've got another thread on this radio here http://philcoradio.com/phorum/showthread.php?tid=14172 and I posted on the antiqueradios forum as well http://antiqueradios.com/forums/viewtopic.php?f=6&t=297064.   I think I'm going to need a custom built pot and I need to make sure I've got the value correct.
Thanks,
Keith         [url=http://philcoradio.com/phorum/showthread.php?tid=14172][/url]

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RE: deciphering Philco Potentiometer numbers - morzh - 03-24-2016

Keith

Have you tried Oldradioparts?

On a smaller Philco I successfully used a today's pot.

Also sometimes if the pot is still a pot, only with much higher value, some effect could be achieved by simply paralleling a resistor across the end pins, so the total resistance is in this case 350K (500K resistor).
In some cases even without doing anything it will work.

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RE: deciphering Philco Potentiometer numbers - keith49vj3 - 03-24-2016

Thanks Morzh,  I've contacted oldradioparts and I'm pretty sure he can make me a new pot.  I went ahead and opened it up to see why the switch wasn't working.  There is a metal tab that has been folded back and forth  to the point where it is literally held on by a thin tread of metal.  If I could find a pot with this same type of switch I could probably fix the switch and then fix the pot by putting a resistor across the terminals as you suggested.  Is this a common switch type?
Thanks,
Keith

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RE: deciphering Philco Potentiometer numbers - morzh - 03-24-2016

I think you can just clean contacts of the switch with alcohol and then some Deoxit. If they are not bent it might work.

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RE: deciphering Philco Potentiometer numbers - keith49vj3 - 03-24-2016

The tab that engages the switch is cracked to the point that I could break it off with a feather. I definitely need a new switch or a new switch/pot.
Keith

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RE: deciphering Philco Potentiometer numbers - Kenneth F. Besso Jr. - 03-25-2016

  Talk apart and braze it….if copper,,or try solder,,,maybe

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