I could try to buy four other power transistors from for example Digikey, instead of installing the four ones i have... then we could look away from that possibility of the transistors being faulty... would that be a good idea?
About insulation pad, i have bought new ceramic insulators to use on the power transistors!
But at the moment i were adjusting the amp, none of the transistors were screwed in to the heat sink, all were just standing on their legs with good clearance to the heat sink.
I could not feel any heat from them, before or after.... it only went about a minute after adjusting VR403 before the fuses blew.
About insulation pad, i have bought new ceramic insulators to use on the power transistors!
But at the moment i were adjusting the amp, none of the transistors were screwed in to the heat sink, all were just standing on their legs with good clearance to the heat sink.
I could not feel any heat from them, before or after.... it only went about a minute after adjusting VR403 before the fuses blew.