i've got one for ya if anyone wants to diagnose it. I have a VTL monoblock with an intermittent hum. sometimes it is preceeded by a volume spike (in a monoblock that is supposedly run wide open whith volume controlled at the pre...and it follows the amp so not a pre issue). the hum always goes away if you toggle the power switch (with tubes you don't even hear the toggle effect on the music the hum just goes away). sometimes it will go away if the other amp or the pre is toggled. sometimes it can go away...or start again if you wiggle the audio input at the amp. i wish the darn thing would break so i could send it in for repair. shipping for a checkup is pricey
Amplifier hum: Does it need repair?
I have a Bel Canto Evo2 amp. Lately, I've been noticing a low level hum from my system which is intermittent in nature. Today, it seemed worse, and it didn't go away in a few minutes like before. I turned off the turntable and determined that the hum wasn't eliminated when I moved the preamp source selector to CD. It also wasn't affected by the volume control. I turned off my Supratek tube pre-amp and determined that the hum persisted. Then I unplugged the two Vandersten subs and still heard the hum. Finally, I took the power cord out of the power strip and plugged it diectly into the wall. The hum was still there. The only thing I haven't detached are the speaker cables. It almost sounds like the hum is coming from the amp and not is not coming out of the speakers, but I'm not sure about that. I really don't want to have to ship it back to the factory for a repair. What do you think?
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