Up for sale here is this matched set of 2 NOS vintage Allen-Bradley) 250k ohm linear taper potentiometer, part JAIN056S254UA. These test around 290k-300k ohms. I have a bunch of these, but will make sure that your pair is pretty closely matched.

These have medium-length 1/4" round shafts with flathead slots on the ends, so any standard 1/4" round hole knob will fit. These are guaranteed to work great for you. These are pretty rare potentiometers and would be great on your amp. They may fit in some guitars but might be very slightly too big for others. Please see my pictures for details, dimensions, and sample test results.

US shipping and handling is $6, and international is $20, no matter what quantity you buy. All of my small parts are set up for combined shipping--just use the "add to cart" feature and then check out at once, and the shipping will be automatically discounted.

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