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Old 6th Sep 2019, 11:09 pm   #18
Herald1360's Avatar
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 15,012
Default Re: 1 Meg ganged log pot

Used as is a 500k pot will introduce some bass cut. If you can live with less maximum volume, you could add a 470k resistor in series with the top end of each section which would leave the circuit untouched as far as the amplifier is concerned.

So far as upsetting the amplifier with a single pot mod is concerned, the area in question is outside any feedback loops and as such as long as there's a dc path to ground for the grid you can't do anything upsetting. It's also outside the tone control circuit so it won't have any effect on the function of that either. It will have some effect on the overall frequency response compared with the original circuit at low volume settings as already mentioned.
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