[Hi All -- this is an amp-related electronics/repair question. Please advise if this should be in a different forum? The electronics one seemed more oriented to pickups than amps.]
Does anybody here have any exprience with adjusting the power stage bias pot in an older SWR redhead?
The schematics I have don't note any calibration voltages or procedures, or even the desired quiescent current in the output stage.
I did scope the amp on a quiet 1K sine wave, figuring I'd tweak the pot looking for crossover distortion. Unfortunately, one excursion of the pot was extreme enough to blow out a small signal transistor in the limiter circuit. So I thought I'd ask if anybody was aware of the procedure here before trying again...
thanks much,
--FritzM.
Does anybody here have any exprience with adjusting the power stage bias pot in an older SWR redhead?
The schematics I have don't note any calibration voltages or procedures, or even the desired quiescent current in the output stage.
I did scope the amp on a quiet 1K sine wave, figuring I'd tweak the pot looking for crossover distortion. Unfortunately, one excursion of the pot was extreme enough to blow out a small signal transistor in the limiter circuit. So I thought I'd ask if anybody was aware of the procedure here before trying again...
thanks much,
--FritzM.
