john stumpf
Super Member
ive rebuilt my main amp board and as the service manual gives ZERO info im in search of adult supervision but first let me tell you what ive done all electrolytic caps are replaced 2sc497 and 2sa497's replaced with ksc2690 and ksa1220.2sc458's replaced with ksc1845. outputs replaced with mj21194g's all four trim pots replaced with bourn items 50 and 100k. ive researched this and it would seem that the consensus was to adjust the 50 ohm pots to achieve a 20millivolt reading on the test points to ground. the highest i can get is 10 millivolts on the left and 5 on the right. as im not at all sure what its supposed to be im not sure if im chasing my tail or not. all testing was done on aux. .with volume control set to nil.b+voltage is 71 vdc. it seems to play quite nicely.