Behringer BXL 1800A finally working

[oc disorder]

Well after an unrealistic amount of time the Behringer bass amp is finally going.
It initially had blown IRFP9140N and IRFP140N mosfets and a couple of burnt
220 ohm resistors with the main supply copper track also fried.
It turned out the reason for DC at the output after replacing the damaged components was lack of supply to one of the MJE 340/350 drivers.
This was due to track damage I missed.
It didn't look pretty but it worked!
I think next time I may pass on repairing small boards with extensive track damage.
I think the owner was "celebrating" at the time and pushed the amp way too hard.
I noticed it was tricky setting the bias for 5mV over R1. The pot seemed very sensitive and initially on turn on it would go to a higher setting then settle back to a lower reading before starting the slow climb as the amp warmed up.
I got it stable at about 4.6mv.
Thanks Enzo for your help, your knowledge and ability to cut to the chase is invaluable.
Also thanks to miguelplus from Peru ..

[Enzo]

For a bias seting like that, don;t fight it, let it be a little low if it wants. A tiny bit of crossover distortion would never be heard.