View Single Post
Old 17th Oct 2019, 11:01 am   #5
tony brady
Hexode
 
Join Date: Mar 2014
Location: Peacehaven, East Sussex, UK.
Posts: 278
Default Re: Goodmans Model 150 Amp Fault

have you measured the voltage across VT809 while adjusting the bias pot? does it change at all? if not check VT809 and the pot

I would also advise changing both bias pots anyway as if the wiper goes o/c the bias goes to max ( daft design, the pot should be in the lower amp for fail safe)

if the voltage does change I suppose there's an outside chance C812 is duff. The arrangement with R830 is not that unusual, it helps to turn off the o/p trs faster.

what did you replace the MJ802 with? I have to ask is it possible it's a fake?
tony brady is offline