Up for sale here is this used vintage 1950s or 1960s Allen-Bradley Type J 1 meg ohm potentiometer. This is a linear taper pot and measures around 1.191 meg ohms. It has a short 1/4" round shaft, so any standard 1/4" knob should fit. This is guaranteed to work great for you, though it may need some Deoxit. The terminals have a little vintage solder and wire bits on them. This is a pretty rare potentiometer and would be great on your amp, though it probably won't fit in a guitar. Please see my pictures for details and dimensions.

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 pots and other vintage electronics listed--feel free to take a look!