Noise at start-up of one mono-block


I have a pair of Quick-Silver mid-mono monoblocks. Over the past couple of days, each time I switch the left one on and after the tubes heat up, (about 5 to 10 minutes) the amp makes a loud buzzing sound.

If I switch the amp off and on again then the buzz stops and does not come back until the amps has been shut-off over night.

Any ideas on what the problem could?

The amps are less than a year old.
The tubes are biased and the bias holds.
The noise occurs even if the pre-amp is off.

Is this the result of a faulty input or driver tube?
nick_sr
The amps are less than a year old.

Contact your dealer first,if you get no satisfaction then contact the manufacturer.
Just a thought.
Switch all the tubes from one monoblock to the other.
That should tell you if it's the amp or a tube then proceed from there.
Call Quicksilver Audio and talk with Mike Sanders. He is a great guy. I am sure he will help you out.