@dpop - My amps have no audible hum with my ear up against the speakers. My speakers are 98db/w efficient. All tube amps don't have hum problems, and all solid state amps are not hum free.
Hum on Tube Amp - Can't find source
I have a hum (60hz) I can hear on my speakers and it happens with my tube monoblocks (either of them). With or without interconnects, it even happens on either amp (have tried one at a time) with every circuit on the house tripped/disconnected, every other component disconnected from the wall (including the Internet/CaTV line) and no interconnects.
One amp has it as soon as it warms up whereas the other one is intermittent.
Hum X doesn't solve it, iFi Ground defender either, AVA HumDinger on powerline doesn't solve it either.
I have replaced the tubes and both amps were just tested at the factory. Replaced the circuit breaker, tightened every wire on the breaker box, checked and cleaned all connections to ground rod. Added a hum eliminator to the internet line.
Hum cycles a bit with the tube glow matching the cycles.
I'm waiting on the power company to come check the power coming to the house.
Thoughts?
- ...
- 145 posts total
@rocray Yes I have. They have been great! The amps went to them for an unrelated check up as I was resetting up my big system. They found no issues with the amps other than a non-oem fuse holder (by a prior owner) which was removed and brought back to spec. I have followed their instructions and it makes sense to me that it ain't the amps. If it were, I could see one of them exhibiting the behavior but not both. |
@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). |
I’m glad to hear that.
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.
|
- 145 posts total