The sunn Forum
Sunn Musical Equipment => Q & A => Topic started by: george on December 11, 2010, 07:48:42 am
-
Fixed the power amp but now the problem is the preamp. I can chase a signal to the input of the VCA (SSM2013) but nothing at the output of the VCA. I checked the bias on the VCA and the V+ rail is only 10V. I rebuilt the positive regulator on the PA board but I still can't get +15 rail back up to 15V. The negative rail is okay. I have to assume that some of the other dual OP-amps are damaged and pulling the supply rail down? So now I know why someone wanted to airlock one of these amps
BTW does anyone have a readable copy of the schematics for this amp - the ones attached are pretty ratty?