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.
>
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