I know this sounds left field, but try different cables from your pre to power amp. I have a tube pre and ss power. I bought some high end cables and they produced a buzz. Replacements were tried with the same result. Put in old generic cheapos and the buzz went away. I would make sure the shielding on the interconnects is plenty thick. Again, this is one person's suggestion.
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!