alright, i have this high pitched tone that is either coming out of my head or my cab, a dont know witch, but i can still hear a small tone from my guitar, but the tone overrides most of it. did i lose a tube? or is there something else wrong?

its a B52 AT 100 w/ tri mode rectefier head
and a marshall mg 412 cab (crappy i know)

Hmm, could be a tube, did you check that all of them are lit up and glowing. If you don't have much experience with tube amps I would have a tech look at it since it could be any number of things.
I don't give a shit if you listen to me or not
Most likely a tube
Quote by GeneralGrim
So we had a music battle, copying what each other did and upping the ante and whatnot. After awhile of going nowhere, I said to the pianist "let's see you do this, asshole" played a single note... and bent it up a step. And left.
Sounds like a power tube went microphonic on you.
Now it's 1984
Knock knock at your front door
It's the suede denim secret police
They have come for your un-cool niece