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Cleaning the switch won't help

If you look at the schematic, the 49.9kohm resistor is *soldered* to the PCB. It is the other values that are connected in via the switch.

It is 99.9% chance that the input JFETs have gone bad. As long as the local dealer can get the correct part from Audio Research, this will be the way to go. I would guess this will cost around $200, as most shops are aroun $100 per hour. Good luck!


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