[rfeenstra]

Well Crap!!!  I was watching Buzz's video on a Philco 45 when a buzzzzz started in my audio.  I thought it was a Buzz problem till till I looked over at my Scott amp and saw one of the 7591's quite red inside.  So my buzz was not Buzz but my buzzing Scott output.  Quickly turned it off.  More work to do.  I've left this thing on overnight many a time (I am over 65 so I forget to turn it off).  I'm glad it happened while I was watching Buzz. I'll blame Buzz for my buzz.  Don't know if it's a tube or the bias supply.  I think now is the time to instal the "IBAM" bias upgrade that you Fisher guys are using!