Keith G wrote:

Dave, Peter's come up with a pretty through investigation procedure and I'm
sure he'd get to the bottom of it, but if I were you I'd just run it in to a
repair tech unless you're confident about fettling it. Contact your seller
first? Also, is there a warranty running on it?

Thanks for the vote of confidence. Like most basic diagnostics, it
takes longer to write it out than to actually do it. I get VERY
squirrelly about visiting suggestions on other's equipment remotely
until I have a very good understanding of both the nature of the beast
and its proper behavior. So it drives me nuts when I am presented with:
"I have this amp, it doesn't work.... Any ideas?

Apologies to Dave are in order and herewith tendered.

Peter Wieck
Wyncote, PA