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Interesting question. I read in my RM-9 manual and also mentioned yesterday in a conversation with Roger, the power amp should be the only grounded device in the audio chain. All other devices should have their grounds lifted, making the amp the focal point for grounding, diminishing the potential for ground loops.
I thought it should be the preamp, as everything is connected to it...
How can we determine the polarity of any component in terms of which way the plug should go into the socket; such as with the volt meter; on what position should it be set, where do we put the black and red probes (careful now); what reading(s) determine(s) which way the plug should go, etc....?