2. amps-preamps
  3. 1270085894

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

Showing 4 responses by rrog

rrog
1,958 posts
 
I would replace the output tubes in both amps. With fresh output tubes in both amplifiers you should get a powerful balanced sound.

Also,I recommend ordering the tubes from Quicksilver. They know best when it comes to sorting and matching tubes for their products.
rrog
1,958 posts
 
I was going to recommend trying KT88s in your amp. I don't have experience with your amplifiers, but I have owned other Quicksilver amplifiers with KT88 tubes and the sound was very good.
rrog
1,958 posts
 
Call Quicksilver Audio and talk with Mike Sanders. He is a great guy. I am sure he will help you out.
rrog
1,958 posts
 
I am not familiar with EH KT88s. They may need a little burn-in time to sound their best.

Quicksilver has been selling Chinese KT88s for years. They sound very good. In fact I was considering Gold Lion reissues for my Dynaco MKIIIs, but all recommendations were for Shuguang Chinese KT88s.

Let us know how it goes with the EH tubes.
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