rollo please clarify the procedure for dumdumhead over here - OK, you measure AC voltage between the ground pin of the AC power cord and the signal ground from an input/output jack? With wires connected or without? Plugged into wall or not?
I have some wicked hum on radio that I am killing with transformer, but it would be cool to track it down. I tried measuring it with DC but it always read 0. Never tried measuring AC even though it was 60Hz, shoulda thought of that...
Thanks!!!
Rich