Quote:
Originally Posted by dieseljeep
That is a strange approach to a tone control circuit. I has a ganged pot with a common shaft to turn both pots. I looked at the schematic you have and it's clear enough, other wise, I could send you the Sams. It's only one page, printed on both sides.
Use contact cleaner on all the pots and replace the tone compensating caps.
Make sure the return to ground on the control sub-chassis is solid.
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Well actually I returned the unit to the gentleman today and even with it working as was he was tickled pink that the record player changer still worked without me having to overhaul it and that all I had to do to fix it was clean the 12AX7 tube socket and replace the cable for the record player. and then replace the old 12AX7 which was gassed(it was cracked all the way around which broke the vacuum in the tube.) I was actually out of contact cleaner so that's why I wasn't able to clean the controls properly and I didn't have any money to get any. He didn't seem to care that the tone control knob wasn't working 100%, although I did get something pretty cool today when I took the record player back to the gentleman I worked on the record player for, I got an old tube powered phono preamp unit and an old RCA Intercom unit and an old Westclox Baby Ben alarm clock.
