Try removing and re- seating the tubes. Swap the left channel w/ right. If hiss goes to other channel, you know its the tubes. Fortunately, the tubes in the pv 10 are readily available and in expensive. Good luck.
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I had a PV10A that exhibited those symptoms. I tried about 5 different brands of tubes and the problem continued. Finally, I shipped it back to CJ and they replaced the sockets that the tubes are seated in. I don't know if that solved the problem or not, because I sold the unit without testing it.