This may be of interest
https://www.pinkfishmedia.net/forum/...-krell-ksa50-=
fan-heater.227491/
(Still not heard it yet -- the latest info is slightly worrying in fact, I =
got an email saying:
"There is a slight hum from the transformers which is pretty quiet most of =
the time but at peak TV time last night with some DC on the mains it did hu=
m quite badly so you may want to use it with a DC blocker. To be clear, thi=
s is from the amp chassis itself and mechanical hum from the transformers a=
nd not hum through the speakers. It is silent from the speakers in backgrou=
nd noise." )