hifi engine

Carver C1

Hello all. I have a Carver C1 preamp which has a faulty volume control (volume is maxed no matter what poition knob is set at). Does anyone know where I could find a replacement one? Also, I have a parts phase linear 1000 autocorrelator/range expander which I beleive is a carver make as well? Would that volume control be the same or interchengeable? Thank you.