friend, I tell you something I don't have a voltage output through the preamplifier or the power stage,
but something happened to me that I still don't have
I started the amplifier and touched a somewhat hot driver, I went and replaced it with another one, thinking that it could be on the run,
I turned on the ampli and it sounded good and I didn't deactivate the relay, but after a few minutes puffff burned 4 power transistors at the same time, but still not why?
If you replaced the original transistor with another, it is very likely that the driver you used was forged.
> Remember that every time a transistor is replaced in a Power Amplifier, the BIAS setting must be performed
> To avoid such accidents, place the amplifier in a 100W series lamp until the amplifier is repaired.
Best regards
friend thanks for your input I did not manage to repair the amplifier I did not find the fault and returned it to the client, but I took a GOOD experience and learning with this amplifier in advance thank you very much
until another opportunity that needs your help