Jerry,
Thankfully, none of that is necessary. It's a stock item:
http://www.maplin.co.uk/standard-dual-gang-potentiometers-2207
Steve G3TXQ
On 07/02/2011 16:15, Dr. Gerald N. Johnson wrote:
Dual, single, triple, or quadruple 220K log pot is not going to be a
catalog item. 250K, maybe, but 500K has the best odds at a shop
specializing in fixing guitar amps. There are some of those on line with
pots at reasonable prices. 500K was the standard value for an audio gain
pot with tubes. Guitar amps like to use tubes yet. Now to make a 500K
linear pot do 220K log curve, put the pot in parallel with a 390K. If it
was a gain pot I'd put that from wiper to ground, but in this
application its a rheostat. This resistor will make the 500K linear pot
function close to a log curve and when the pot goes open will still keep
audio working.
211K is closer to 200K, pots never did pick values on the RETMA 10%
series, but round numbers like 100K, 250K, 500K, and 25K.
|