Try Michael Percy's web site. He might have them
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Wondering if it depends on designs there matched with.As someone who never swapped out (and hell it's a ubiquitous item on most deivces) wonder if somebody could tell me.Wonder what equipment these pots were changed on.Would it make sense in some gear (like my 834 EAR intergrated ampo not knowing of course what's in there) or the 834 volume people knock on the EAR 834 phono.
Penny & Giles (www.pennyandgiles.com) are best known for their line of "industrial" controllers and linear faders. They also make a rotary fader (model RF15) which is the volume control you are asking about. It is built like the proverbial tank and looks like it would withstand a nuclear blast. I used these in my Deluxe Line Drive series of passive preamps back in the '80's, but gave them up after I found a part I liked better - the TKD conductive plastic pot. Like Penny & Giles, TKD makes a line of industrial-grade linear faders, but they also make rotary faders (potentiometers) and stepped-attenuators. These are excellent volume controls, but the stepped parts have gotten extremely expensive. The conductive plastic pot (CP2511) can be had from Michael Percy Audio (www.percyaudio.com) for $62.50, while the stepped-attenuator goes for around $250.