I have been fixing a Rolls RA200 amp and replaced all the blown mosfets, fuses and some failed solder joints.
However i noted while i was working on the amp that once i got one of the 2 channels working it had 50v DC on the output. as soon as the other channel was up the DC went away.
later for as yet unknown reasons one of the fuses blew on one output and as soon as that happened the other output then had 50v on it frying my speaker.
this amp does have protection so should it not have triggered?
wondering if this is related to biasing? like if one channel is dead the bias is going to be 50v to the other working channel?
However i noted while i was working on the amp that once i got one of the 2 channels working it had 50v DC on the output. as soon as the other channel was up the DC went away.
later for as yet unknown reasons one of the fuses blew on one output and as soon as that happened the other output then had 50v on it frying my speaker.
this amp does have protection so should it not have triggered?
wondering if this is related to biasing? like if one channel is dead the bias is going to be 50v to the other working channel?