The Phase Linear 700B used to power my brothers 2235H's in 4343's has died.
Luckily he is astute enough to always put the line speaker fuses in AFTER turning on the amps.
A few days ago he turned on the 700B and the meter needles went up into the red and smacked into the end stops and stayed there.
On the bench today and both rail fuses (something like 10 amps) had vapourised and 2 output transistors are short collector-emitter.
The thing is why? We think the problem might be a dry joint somewhere as it did this to the other channel about 15 years ago.
I think it's going to be nasty.
Ian