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What are the two black ports on the back of the unit labeled with the letter “G”? There is one on each side. Thanks!
“G” is sometimes substituted for - negative/black. “G“ being referenced here as common or ‘ground’, or ‘reference’. Hook up the left and corresponding right black speaker wires and you will have a nice little amp. You will need high efficiency speakers like Klipsch, and some nice NOS tubes will complement well.