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It's an old Sound Workshop 34c desk that was completely rebuilt around 2002 or so and has been remarkably trouble-free. I would normally assume it would be dirt or leaking DC on a channel. But the fact that it is on everything, makes me think power supply.
So, if you think this is a valid point, my question is:
If I put a scope on the outs of the two +/- 16v supplies (and they verify at 16v) will the scope show me noise on the rails that might be causing the scratchiness?
--it could be dirt in the connections between the supply and the cable, and the cable to the console. so will clean those when I pull the supply out.
-- i am testing with a 100Hz tone. With music, the knobs are a bit quieter. switches still bark....
As a last resort, and I mean last, I will sink all 32 modules and master section in the old Ultrasonic Bath. What a hassle that would be. NYC is a dirty place, but this seems like more than that.
Thanks, in advance for any insight!
Last Edited By: oof Jan 15 17 4:40 PM. Edited 1 time