Like which pair of J50’s out of the bunch are suspect. The ones that came out of channel with the burnt pair of K135’s. Unless there is another explanation that makes sense.
Not a damn thing wrong with most of them. They probably came out of working channels. I wouldn’t throw “survivors” out, but I would put them in B stock for experiments that may end badly.
Not a damn thing wrong with most of them. They probably came out of working channels. I wouldn’t throw “survivors” out, but I would put them in B stock for experiments that may end badly.
These V-MosFet are very robust, even when they are only a few amps. I once made a stupid mistake while testing a mono made with from 3+3 SJ/SK.
It had an extremely powerfull 700VA transformer and the output relais with four 20A contacts were brightly arcing for a few seconds, until I managed to pull the power. The amp and transistors didn't bother, only the relais were burnt. The only time I have ever seen an audio amp do that.
These amps were even used by physicist at our university, for switching magnetic lenses, because they needed fast and reliable switching.
Funny they even sound quite well...
It had an extremely powerfull 700VA transformer and the output relais with four 20A contacts were brightly arcing for a few seconds, until I managed to pull the power. The amp and transistors didn't bother, only the relais were burnt. The only time I have ever seen an audio amp do that.
These amps were even used by physicist at our university, for switching magnetic lenses, because they needed fast and reliable switching.
Funny they even sound quite well...