Jeff, thanks for the example. A question, I believe I've seen with this type amp, push-pull IIRC, where there is a common 'center' rail, where that voltage is 0, and there is a negative voltage for the lower waveform, and positive for the upper waveform, could you attach both probe's ground to that center rail and get the same waveform when displaying both channels? Assuming there is no potential between that rail and scope chassis.
Also, I'm not really thinking in terms of elevated voltages, perhaps I should be so not to limit the discussion either.
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