another smokey day

Well, the brick cooked 2 more FETs today, who knows. Power supply interference maybe I don’t know . also an input filter cap popped along the way, due to? cause of? who knows but i am looking at a better RF choke on the power supply line coming right into the amp. This pic shows whats there and what popped, it cooked a cap into pieces and there is only supposed to be 50vdc on it and no RF. well, I think maybe there is a ton of RF on it over 14mhz..so tomorrow I’ll try that direction. FETs replaced and re-biased. its working again but i’m not running it over ~50 out until I figure out how the smoke is getting out of these……FETs!!! I cleaned the board up, installed some 3.1kv .01 and a 6kv .001 cap in there. if that pops there is some serious shit going on in there!!!

 

 snap! Crackle POPferrite beads around the power lines coming in..maybe not helping?

 

FOLLOWUP —-

found out the caps they had in the kit were under rated. ah HA! a gotchya….

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