Hum on Tube Amp - Can't find source

@ervikingo There’s been no mention yet of biasing. Have you checked it for all tubes? From the Manley Snapper manual, this is the rated Noise Floor spec: Typically 105µV = -77dBu A-WGT Typically 388µV = -66dBu unweighted. Depending upon how close your ear is to the speaker (inches away?), with that type of noise floor spec, my ears would probably hear some hum too (especially at -66 dBu).

Manley; The Snapper manual

@jaytor

My amps have no audible hum with my ear up against the speakers.

I’m glad to hear that.

All tube amps don’t have hum problems, and all solid state amps are not hum free.

I would agree with you. All of the tube amps I’ve ever owned, did (have a certain amount of hum). I prefer my noise floors to be in the -95 dBu area (exceptions being vinyl playback). With that in mind, I could never find a tube amp that approached that. I’m not saying they’re not out there, I just however gave up my quest trying to find one. When it comes to tube headphone amps, I also don’t like the fact that rarely have I ever heard one that sums to mono, correctly (like SS does) 100%. This matters when listening to any audio mix, as the mixing engineer many times will pan certain sources to center (mono). Many wouldn’t notice this, or care about it, but I do.

60Hz.   Has to be a mains hum.

Take all your kit to a friend's house and see if you have the hum.

If not, it's on your mains.  Get engineer in.

If it is still there in your friend's house then it's your kit.  Swap each item in and out and find the culprit.

QED.  Clearthinker OK.

I read an article and they said tube amps hum.  That would drive me nuts.  

@clearthinker thanks.  lets see what demonstrates...