DefQon Posted July 7, 2015 Report Share Posted July 7, 2015 (edited) An update, the SRA-12S that had a dead transformer has been replaced with one from another 12S. Now I haven't touched anything on the two output boards except replace the 50kohm resistors. I powered on the amp and all measures were fine and plugged in a spare SR-3 to test. Left channel works, right channel does not. So it could be a bad HV transistor or trimpot balance going off, swapped the output boards and issue still persisted with right channel. Made a measure for dc offset and balance. Measure the working left side first and it was floating around 0.4-7vdc. Measured the right side and holy shit 195-225vdc, measured the dc offset on right channel (-/+R) and it stabilised at about 380-400vdc. What the fuck is going on? Checked the underboard wiring and all is correct, tried turning the trimpots and no values changed. Any ideas? I have a feeling the trimpot has gone bad, as I did clean the boards last time, one is 50kohm and other is 500ohm. Which is dc offset and which is for balance? Edited July 7, 2015 by DefQon Quote Link to comment Share on other sites More sharing options...
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