| any potentiometer of similar rating should work - unless it is a double/concentric or
has a switch,center tap etc...
they're usually marked (250k ,220k,500k etc) or you can measure the resistance across
the first and third lugs w/ a meter. some have knurled shafts , some flatted , and some round .
many instruments use Audio taper , some linear, but either will do the job if you're not sure.
just measure what you have and find something that will work. | 
