Up for sale here is this NOS unused Pioneer ACV-168-A rotary treble control. This is used in the SX-1050, SX-1250, SX-1280, and SX-1980. It is brand new, and is guaranteed to work for you, but may need a shot of Deoxit. Please see my pictures for details.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.
I have more Pioneer parts and other vintage electronics listed--feel free to take a look!