Low level buzzing coming from tweeters.

I’ve been thinking about the tubes and whether they could be the culprit. There’s about 2200 hours on the power tubes (WingC 6550’s). It will be a chore to test them (12 per amp). I have a B&K 747. Then there’s the small tubes (driver and input, 3 each amp).
Sooo . . . I’m looking at 30 tubes. I guess I’ve got to get myself cranked up to do that.

In the meantime, I’m going to test with a solid state amp (the horror!) just to confirm it is the amps. I’m still a little puzzled over why both speakers have the same issue (the buzz). What are the odds?

@ncarv

If a tube is doing this, it won’t be one of the output tubes. They can make cracking and popping sounds but a low level buzz is unlikely.

@atmasphere 

Thanks for the tip. Saves me from a futile testing regimen.

I’m planning on trying a solid state amp this weekend to rule out possible electrical problem.

Switched the amps between the tweeters & woofers. Buzz was originally from the tweeters. The buzz now came from the woofers, tweeters silent.. Gotta be the amps?

 I have a pair of atmosphere m60s and had that problem and it turned out to be an input tube.  I also have a LuTron dimmer in my room and whenever the lights are on I get a little buzz as well.