
dgatwood
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On both units when you started adjusting the input gain, right at the halfway point as you turn between 2 notches the overload light comes on and the unit puts out a loud surge or pop. It does it at the exact same place on both units. I turned down the gain and worked the knobs back and forth thinking maybe it would stop, but after 20 times they still do it.
I wonder if there's a DC offset at the switch, and if so, if it would be reasonable to add a filter cap to get rid of it.... I'm not about to try to figure it out from the partial schematics I've seen, but you could check it pretty easily with a voltmeter. Put the black lead on a ground somewhere (e.g. the chassis or the shield of a plug plugged into it), then touch the red lead to each of the switch contacts and see if there's voltage present. Experiment and see if there's only voltage in certain switch settings.