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The PA 7 ran into class A, more than the PA 7II, which meant, a warmer sound than the PA 7II.
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Total BULLSHIT
I own a PA 7ll and Ive listened extensively to a PA 7 The ONLY difference between the two is the upper wiring, the latter being a birds nest of wires aka "Cottage industry" wiring vs Nakamichi's professional job of cleaning it all up and adding a few more watts.
BOTH amps are stellar and neither is "the ONE to own", they BOTH are.