2. amps-preamps
  3. 1209864603

pre-amp unacceptable noise level?

How much is an unacceptable level of noise/humming etc. from a pre-amp? I just bought a new tube pre-amp and when I replaced my old solid state one with it the noise level from the speakers practically tripled. There is an audible humming from the listening chair 10ft. away. I can't say I'm particularly happy with this considering the one I replaced did not do this.
fruff1976

Showing 2 responses by sugarbrie

sugarbrie
3,854 posts
 
You do not need to bias the tubes with preamps.
The cheater plug would go on the power amp, if that is the problem.
Is it both channels or one? If one, you might have a bad cable.
If the hum is there with both preamps, then it is not the Rogue.
Tube preamps are usually not as quiet as solid state, but is would be the normal hiss sound that would be louder, not a hum.
sugarbrie
3,854 posts
 
You may want to try different tubes as suggested by others.
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