2. amps-preamps
  3. 1077600912

Buzz through speakers w/amp on & pre off

I'm experiencing a buzz through my speakers which makes it impossible for me to leave the amp on continuously. It only happens when just the amp is on. If I unplug the preamp the buzz gets slightly quieter, and if I unplug the cd player the buzz gets quieter, but barely enough to notice.

The second I turn on the preamp the buzz goes away completely. The second I turn off the preamp the buzz comes back. It doesn't interfear with listening, but I would like to be able to leave the amp on all the time.

Has anyone ever experienced this?

Here's what I'm using.
unmentionable cdp
Anthem Pre 1L
Classe ca-200
Thiel 3.5
It buzzez both with and without the Thiel EQ box connnected.

Any thoughts?
thanks,
kevin
ketchup
sbank's avatar
sbank
2,038 posts
 
Could be a ground loop. Try a cheater plug on your amp, then move it to your pre. Just went through same thing. Cheater plug on my pre solved it.

Cheers, Spencer
mcfarland
356 posts
 
I thought that it was unwise to have the amp on with the pre-amp off.
matt_zak
55 posts
 
You should never keep your amp on if your pre is off...either keep both on or both off.
jack46527
4 posts
 
Leave amp and preamp on all the time, or turn both off at night. Amp on without the preamp can do this, and I've heard it is unwise...I'm no engineer, so I don't know why, but I leave my amp and preamp on all the time.
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