2. amps-preamps
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Hum in VTL 125 mono block amps

I have VTL 125 mono block amps they are about 11 years old with fresh tubes as of late they produce a hum or buzz in the speakers that they never had . Nothing in the system has changed , I get the hum- buzz even with the pre amp muted the level of buzz- hum does not change even when I un mute the pre so I think the hum -buzz is from the power amps. All eq is on a dedicated 20 Amp line cables are top of the line Ridge Street Audio power cables and Ridge Street poiema 3 IC'S / speaker cables. Do any of you have a idea what to ck is a cap starting to leak due to age or something else. Marc
lake513

Showing 2 responses by newbee

newbee
4,751 posts
 
Couple of other things to try...

1) Disconnect the amp from the pre-amp, muting may not be enuf.
2) Makes sure that all unused PC's are disconnected from outlets (believe it or not another hum I had was sorced to exactly that!).
3) If that fails, bite the bullet and disconnect and unplug everything and start from scratch. One amp to one speaker, then the other, then both together, then add back....Sooner or later you will hear the hum and you will know the source.

Hope that helps a bit.
newbee
4,751 posts
 
Could be you are getting some low level hum from the small tubes? I've had that problem recently and solved it with new/different small tubes.
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