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 Post subject: 1meg resistor across volume pot
PostPosted: May Mon 16, 2005 8:24 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1644
Location: Mesa, AZ, USA
I am working on a Philco 38-12.<P>There is a 1 meg resistor across the volume pot. Volume pot is 500K.<BR>The resistor does not look original, nor is it featured in the schematic. Any idea what it might be doing there?<P>------------------<BR>-Mike


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 Post subject: 1meg resistor across volume pot
PostPosted: May Mon 16, 2005 8:31 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 31648
Location: Livermore, CA
Hi Mike<P> It's not necessary for the circuit. Maybe someone replaced the volume control with a higher resistance one? <P> Be sure coupling cap .01 mfd (#15) from control to 1st audio stage has been replaced. A resistor like this would help load the AVC line and make up for a leaky coupling cap?<P>------------------<BR>Norm


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 Post subject: 1meg resistor across volume pot
PostPosted: May Mon 16, 2005 9:07 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1644
Location: Mesa, AZ, USA
The volume control appears to be original. It is the correct 500K anyway.<P>All the paper caps are original, so perhaps the new resistor was to compensate for a leaky cap.<P>------------------<BR>-Mike


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