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Sometimes you can bring those old power switches on those power switch/volume control knob combo controls back to life by spraying some WD-40 into the switch housing flipping the contact back and forth until the contacts start giving you continuity again, and then hosing out the power switch with some contact cleaner and then putting it back together again.
I've done that with a few "dead" power switch/volume control pot combos that wouldn't turn on so I took the power switch off the volume control pot sprayed it down with some WD-40 and then used a small flat blade screwdriver to flip the switch contactor back and forth until it started giving me continuity again when it was flipped into the on position and then I cleaned it out with some contact cleaner and then reassembled the switch back to the volume control pot and then tried it out and it worked fine.
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