Working on a pa150, problem is the bias on one channel is not working properly. On one channel I get +/- .6VDC on the VBE mult transistor, but the other is pegged at +36. All the TO-92 transistors are good, and the drivers seem good as well. Are schematics available? Seems like a pretty basic amp, but I’m getting stuck for some reason.
With no diagram, I'd suggest reinstalling the outputs and pulling the drivers to confirm that you have no offset. Reinstall the drivers and pull or disconnect the next stage back.
Of course, you should confirm that the channel is not being driven with excessive DC at the input to the power amp section.
Of course, you should confirm that the channel is not being driven with excessive DC at the input to the power amp section.
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