A buzz in both channels

[Paul Birkeland]

I don't immediately see the difference between the G and the non-G, so I wouldn't sweat that.  Yes, that is an appropriate replacement for the regulator.

[Skipperrik]

Okay.

I just wanted to say again that I appreciate your help and your patience. I'm sure it can be frustrating to deal with newbies and I'm a great example of that. Thanks!

[Skipperrik]

I'm happy to report that the new parts are installed and the voltages are all within spec. The hum is still present however. I noticed that it isn't present when I turn the amp on, only after the circuits kick in. Also, immediately after switching it off the sound gets significantly louder until it fades away. Could this help in locating the cause?

[Paul Birkeland]

I'd be poking around with a wooden chopstick to see if you can disturb whatever connection is causing the problem, then you'll know where to focus your resoldering efforts.  A cheap-o pair of headphones plugged into the amp is a good idea for this kind of testing, as it can produce loud noises if the poked joint is particularly loose.

[Happy Ghost]

The hum is still present however. I noticed that it isn't present when I turn the amp on, only after the circuits kick in.

I had a similar problem in C2A..in my case, there is a noticeable hum/distortion in both channels..  But turns out to be a problem with the selector switch in the C2A.. I need to push it hard to the current selection and then the static disappears.. I am suspecting a loose wire or a bad solder joint ...you *might* be having a similar issue perhaps. worth a shot..

[Skipperrik]

Thanks for offering the suggestion, Happy Ghost. I have a DAC that has a volume control and I only use one input so I bypassed the selector, balance and volume controls. So far, poking and proding hasn't helped to locate the problem. I"m still searching.