Some light humming from a tube amp with your ears at the speaker is not unusual. Some are dead quiet, some are not. Occasionally it can be from tubes or currect. You might try a cheater plug and see if that changes the hum (I assume all of your stuff is not on the same line (?). You might also check your connecting IC's to insure they are not too close to other electrical devices, including the amps themselves and power conditioners etc. If you can't hear the hum when you're standing a few feet from the speakers it shouldn't really affect the sound, except mentally by us anal types. :-)
Tube Amp Hum
I have a new VTL ST-150 for about two weeks now. Its breaking in nicely, but one thing I notice with this amp is a slight hum through the midbass drivers. Not audible from the listening position, but there nonetheless. I have the amp on a dedicated 20 amp circuit which was quiet as a mouse with the SS amp that was on it before this amp, which eliminates it being a ground loop. Also, all tubes are all seated properly.
So my question is, is this a normal operating characteristic for a tube amp? If so, does it have a degrading affect on the sound? I would like to hear just pure air when my equipment is on like I had before if possible.
thx!
So my question is, is this a normal operating characteristic for a tube amp? If so, does it have a degrading affect on the sound? I would like to hear just pure air when my equipment is on like I had before if possible.
thx!