2. tech-talk
  3. 1210630670

Stepped Attenuator to replace Potentiometer.

Hello: We have a set of Wolcott Monoblocks, for which I am researching replacing the volume pots with something like a DACT stepped attenuator for each mono block. The problem is that I can not seem to find a compatible attenuator that could replace the stock 25 meg ohm pots.

The circuitry is point-to-point wiring, powering eight 6ca7, two 6dw8, and two 12at7 tubes per side. It might be more of a hassle to mess with getting around the stock pots to substitute attenuators; however, I'm not an engineer and would therefore appreciate your informative advice and suggestions. Thank you.
somut

Showing 2 responses by eldartford

eldartford
4,262 posts
 
Set the pot so as to give the gain that you require.
Then, measure the pot seting. Slider contact to high, and to low.
Then install a two resistor divider.
You can leave the pot in place, disconnected, in case you need to reverse the mod.
eldartford
4,262 posts
 
Somut...You better check on the resistance of that pot. 25 megohms is far higher than any audio gain pot I have seen. I could believe 25 Kohms, although that would be a bit low.
More to discover