This amp was brought into the workshop for a “channel dropping in volume” problem, which did indeed turn out to be a bad plug connection.
Like most PCB based amps, much has to come out for fault finding!
All back together & doing the 100 watts from an octet of Sovtek EL84’s!
The
fan which, when the top panel is in place makes a “tunnelling
effect” for keeping the 8 output bottles cool……A
very sensible addition with the EL84’s having around 400 volts on
the plate. This is needed to get the 25 watts from a pair!