Reply To: SC2.2 voltage regulator

[Ted Fletcher]

I have just re-read the messages and see that you actually say that the hum/noise changes with the output gain control.

If that is so then the output stage is OK. But if the problem is in an earlier stage then it should affect L and R outputs (as all earlier stages are in M/S mode). So apart from being certain that this hum/noise is to do with ground paths, I can’t suggest anything else.