I have a need to rebuild some slide pots from 1970's musical equipment that have worn-through resistance strips. The pots are long since unobtainable (made by CTS), and I have yet to find any suitable replacements. The resistance strips inside the pots are removable, and consist of a die-cut non-conductive substrate onto which a carbon resistance compound was bound and on which the slide contact of the pot slides. Each end of the strip has a metal connnector crimped to it to serve as an end terminal for the pot.
I think if I knew what kind of binder and process is commonly used to adhere the carbon to the substrate I could restore the resistance layer. It would most likely have to be baked onto the strip, which is not a problem. For the resistance material itself, I was thinking of using material from carbon comp resistors (it would be trial and error to find the right value for this application). So, I am trying to find information on how resistance material is bound to a substrate for use in wiper/pot applications (it would have to be fairly resistant to abrasion, solvents, etc.) Please email foda01 at epix dot net with any helpful info.
thanks,
Dave