Oh hey,
So as of right now. PSU, Preamp, and one good channel is all functioning well, ( PSU, preamp, and good channel got new Caps and diodes only). When I got the Amp, the bad channel seems like it had been worked on before. I noticed one of the transistors (Q10) was cracked in half, Output transistors Sanken 2sa747a, 2sc1116 burnt, and Transistors Q11, Q12 (NECD381, and NEC B536) was also not working. So I changed the output transistors ( I used NTE bs it was readily available at local frys store, will change to original when I get the amp up and running properly) and I also change Q11 and Q12. When I replace Q10, I decided to replace Q8, Q6, and Q7 because I bought all those transistors as matching pair. I also decided to replace Q3, Q4, and Q6. So now the Kenny has just transformed into NTE . I hook everything up, checked the current bias and Dc offset quickly (maybe too quick), and tested the amp out bypassing the preamp section. It made music for 30 mins or so. Then resistors R32, R22, R23, and and R13 started to smoke. OWWEEE, pretty exciting stuff. So I change those resistors and check the bias carefully this time. Hook everything up, and now only resistors 22, 23 and 13 smoke instantly when I power the amp on. Now I am confused, I just ordered the trim pot, and resistors. I want to fix this bad boy, but really don’t know where to start now. Attached is a couple pics of this little fire starter for your amusement. If anybody else want to see more detailed pics of what is inside a kenny 600, email me.
Any suggestions would be appreciated EW. Once i get this amp going, and it is stable, then i'll swap in better components.