EDIT:
Mine has the faintest hiss or hum that doesn't change at all when I adjust the volume up and down. I don't know if yours has more than that or not, but I am able to hear something. There's no way I can hear it unless I have my ear right next to the tweeter though.
Has yours done it from day 1?
Is the humming coming from both channels?
Do you have any other 12AX7 or 12AT7 tubes you can swap the originals out with?
Is it a 60 cycle hum, or more of a hissing sound?
Are you able to feel any vibration when you place your fingers on the woofer cone?
You may want to test it at a friends house and see if you can still hear it there.
Last edited by Route 66; 07-17-2018 at 02:24 PM.
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