Sure about the model? 555 is a power amp. Did you mean 565?
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Somehow missed that model. I’ve owned/own the GTP-500 and GFP-565, both very decent. Just as an aside, I recently heard the A21 paired with an older Conrad Johnson PV15 tube preamp and I thought it sounded very nice. Much better than an SS preamp it replaced, I think it was a real old model Bryston pre.