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
newbee
4,767 posts
 
Another cause of humming can be from locating a pre-amp too close to a power source, usually an amp on which some people like to stack stuff (ever noticed how many high end pre-amps come with seperate power supplies often connected to the pre-amp by a long cable), and proper cable dressing, that is, making sure all of your IC's are not near any power sources or power conditioners. I've had problems with both of those issues. Easy to cure. BTW this is generic advise - I've never owned a Rogue.
rkny
47 posts
 
My Rowland 102 amp introduced a major hum into my setup. Turned out to be the cable TV. A Jensen Ground Loop Isolator fixed me right up.
fruff1976 OP
103 posts
 
I don't have t.v. hooked up into it. It's just a 2 channel rig with a cd player and I haven't hooked up my turntable yet.
prpixel
876 posts
 
Bad tube? Did you bias the tubes?
fruff1976 OP
103 posts
 
Not sure how to bias tubes? This is my first tube pre-amp. Also, after hooking up my old solid state pre amp I noticed the system noise I'm talking about is present, but not as loud as with the rogue. Is it possible the noise is originating in my power amp and is being amplified to a greater degree with the rogue?
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