My mesa became really quiet and has this stupid cracking noise. Any Ideas?
PRS:SE Singlecut w/ Crunchlab/Airnorton
ESP:Eclipse Standard
Fender:MIM Silverburst Tele
Line6:Pod HD500X
you probably need new tubes.
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
You were the one with the 'Mesa, U make me mad' thread right?

Low volume 'usually' indicates bad power tubes
Crackling 'can' indicate bad preamp tubes - but it could be something else.

I'd get your amp looked over by a tech but you can always buy a few preamp tubes and swap them around to see if the crackling goes away.