Are you seeing pulses of DC approximately the same as the rail voltage on the center legs of the output FETs?
You likely already know but this amp is likely similar to the following:
http://www.bcae1.com/temp/bp1200p1_sm.pdf
You likely already know but this amp is likely similar to the following:
http://www.bcae1.com/temp/bp1200p1_sm.pdf
An externally hosted image should be here but it was not working when we last tested it.
not sure if this was the issue, earth was loose. amp is turning on now.
haven't gotten my scope yet to check.
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