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Old 31st Oct 2020, 11:23 am   #19
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Need help with antique replacement volume control.

For those without a schematic....the "ground" end of the volume pot is connected to the bottom end of the 1st AF amplifier's (a triode) cathode bias resistor, from that junction is another resistor that's connected to ground, those two resistors in series set the AGC delay voltage.

You will need a tapped pot that's tapped at the same point or a standard pot which has been modified with a tap. If the manufactures could have done it with a resistor fudge they would have done so to save the expense of a special pot.

Lawrence.
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