Surprisingly very little, no concern to me. The RE-00 isn't very efficient to begin with. MSR-7 for one picks noise up better.
No 'hiss', but when its pot is maxed it hums faintly with HD800. With more efficient things it's already annoying, but I don't need to crank it all the way. Hiss could easily be bad tube or lose/bad contact with tube base.
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