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Antique Radio Technical Forum
Philco 90 Has Same Volume At All Volume Settings

Posted by Johnny on 04/12/2012 12:18

I just finished overhauling this Philco 90 with the single 47 output tube. It has reception and wants to pull in stations across the dial. But the volume stays the same no matter where the volume control is positioned. I put a screwdriver on the CT of the VC and I get a very audible hum from the speaker. Audio circuit is good? I wonder if I have a bad volume control? The only anomally I can find in the set is the voltage at the plate of the Det. Amp. Paperwork is a little fuzzy but it looks like I should have 140Vdc there. I have 54Vdc.

Johnny

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Philco 90 Has Same Volume At All Volume Settings 
Johnny 04/12/2012 12:18 
Warren 04/12/2012 13:19 
Lou 04/12/2012 13:26 
Johnny 04/12/2012 14:12 
Warren 04/12/2012 15:31 
Johnny 04/12/2012 16:07 
Warren 04/12/2012 17:49 
Johnny 04/12/2012 18:09 
Warren 04/12/2012 18:55 
Johnny 04/12/2012 21:36 
Johnny 04/13/2012 15:32 
Warren 04/13/2012 17:25 
Johnny 04/13/2012 20:14 
Mitch 04/14/2012 16:54 
Edd 04/14/2012 17:28 

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