Audiovox lap steels were made by Paul Tutmarc, who also made the first commercial electric bass. There's a link on this very site to Bud Tutmarc's story about Paul Tutmarc.
I've never seen one of these guitars, but I would assume that if Mr. Tutmarc used a standard potentiometer, you could buy a replacement at any good electronics store.
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Brad's Page of Steel:
www.well.com/~wellvis/steel.html
A web site devoted to acoustic & electric lap steel guitars
AudioVox lap steel
Moderator: Brad Bechtel