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Noisy Power!

I've had noisy power in my home studio. It hasn't been much of a noticeable problem with my recording equipment but I hear the noise in my guitar amps and monitor speakers. I purchased a Furman power conditioner and that doesn't help. Could it be a ground issue? If so, what can I do about it? Thanks in advance for your help!

noisy tracks

I got noise and humming on my tracks, recording guitar.
Usually I always recorded directly into the computer, without any side effects.

Here is the set up and what I do.

A Mesa Boogie Mark V amp, on a stand, and a clean channel, no effects or reverb.
The van is off. Quiet amp.

Noisy Fender Supersonic

I recently purchased a Fender Supersonic head. I know valve amps are noisier than solid state but the clean channel on the amp, especially the Bassman setting has lots of background hiss. Even with no guitar plugged in and the volume completely off, there is a hiss that is very loud. The lead channel is fine and I have checked cables, different speakers, different wall socket, etc.

noisy AKG c214 - may be counterfeit?

I upgraded from an AT2020 to AKG c214, i am currently running a Lexicon alpha into my laptop and adobe audition 1.5, after connecting the AKG the sound is a lot lower with the Lexicon setting untouched and the white noise is a lot higher than i expected, so i need to turn the mic volume louder than i had it with the AT2020, which also increases the white noise.