OD Brightness

[Fischerman]

Ack! Above I wrote that Gil is an admitted HRM fan and I meant non-HRM fan.

[llemtt]

if you do this test, and you hear something, that means that you've got undesired coupling somewhere?

yes

it could be a sign of coupling, a bad grounding, or something else that isn't working properly

you can test that way because with controls maxed the preamp signal reaches 250vpk-pk very easily and with lots of high freq harmonics