Tube Pre-Amp Question


I just hooked up a VTL 2.5 tube pre-amp to my system.
When the volume is off, nothing being played in the CD or other, there is this hum coming from the tweeter in the speaker. It gets louder when I turn up the volume.
What is this?
**I didn't have this with my SS pre-amp.
**Speakers are ML mosaic's. Non electrostat type.

Thanks in advance.
adman227

Showing 3 responses by adman227

Thanks for the feedback. The "Hum" is actually more like the sound of air/ static...nothing really. Not really a hum, more like nothingness/ sound. If that makes sense.
That is right, only when I'm very near...like ear within 6-12 inches away.
Does this effect sound when playing music?
Should I consider rolling or changing the tubes to a different brand?
Also, could this be corrected with better IC's and/ or PC's?
I've been thinking of changing the tubes anyway. People have recommended Telefunken Tubes, and say it's night and day in performance when you do it.