The PHILCO Phorum
Crosley 10-136 - Printable Version

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Crosley 10-136 - Eric - 04-09-2016

Good morning

I have a Crosley 10-136  http://www.nostalgiaair.org/Resources/172/M0003172.htm

I have recapped it and it plays but there is a problem with the Vol so I thought I need to check it out especially since it looks as though it has been replaced. The Pot Resistance show 500k the Print shows it should be 3 meg and a tap at 300k ( parts list). I googled 3meg pot and the highest I see is 1meg and see no tap. Any suggestions on what to do? I have a couple of sites to try yet but I'm not hopeful. Thanks

Eric

RE: Crosley 10-136 - Radioroslyn - 04-09-2016

Hey Eric,
Not quite sure why they spec such a high value control. The one thing that comes to mind is the it does act as a bit of a load for the phono. The higher the input load the better the frequency response with a crystal cartridge. The tap is for audio frequency compensation (tone) at low volume levels.
Given the type of set and size of the speaker I would think that if you did change out the control the difference would be negligible.

 Terry

RE: Crosley 10-136 - Eric - 04-09-2016

Terry,
I sent an email to Mark Oppat to see what he has and I was poking around Play Things of the Past and did find some tapped 3 meg pots he doesn't say if they have switches but will wait till I hear from Mark before contacting him.

What got me looking was the low volume even when turned up all the way and figured it was the 500k pot.

Eric

RE: Crosley 10-136 - Radioroslyn - 04-09-2016

For grins you could turn the volume full up and disconnect the ground (B-) side of the volume control. This will give you flat out all she'll do volume wise.

Terry

RE: Crosley 10-136 - TV MAN - 04-18-2016

For a test, I have tack soldered together a series of 3 or 4 fixed resistors totaling the value of a POT and connected the center tap to a clip lead, moved to different points between resistors to check. It'll give you an idea of where things stand with parts you may have on hand.

RE: Crosley 10-136 - Eric - 04-18-2016

Ok I got the correct pot but which is the 300k tap? The lead going to the .002 cap and on to the 12AV6? Or the 680K/47K lead I suspect the later but I want to be sure as the quality of the print is not that good.

Eric