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for sale here is this vintage 1958 Centralab 250k potentiometer with power snap switch attached. I am pretty sure this is a linear taper pot. It is labeled "Centralab USA" on the front and "134844 8G17 250K" on the side. The "844" means this was made the 44th week of 1958. I measured this and it tests right around 250k. The back has a power snap switch attached, so you can wire this as a combination power switch and tone/volume/whatever control. If you wanted, you could remove the snap switch from the back. This has a short 1/4 "D" shaft, so any standard "D" knob should fit, or any 1/4" round shaft knob with set screw 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. Please see my pictures for details.
US shipping and handling is $4, and international is $12. I accept Paypal. If you have any questions, please ask.
I have a number of other vintage parts, collectibles, Magic cards, and vintage electronics listed--feel free to take a look!