I have that same unit, and mine is quiet...really quiet. You may have a bad tube. I also use it between the source and the pre-try that. Could be a grounding issue too. Any lights on that electrical line?
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Thanks for the responses.
I'm leaning towards a bad tube as well. I've tried several connection options (between pre and amp, soure and pre etc, different cables and power sources) and I get the same results. It's more like static on the right channel whereas the left channel is a more consistant hiss and isn't nearly as noticeable (you have to be right up against the speaker to hear it).
I'll be taking it in for repair on Monday.
Nothing else on this circuit.