Mine used to do that but try waiting till the amp is warmed up and before you switch anytthing let it warm up with the 2nd channel and the fx on and then once you have up standby off...go to clean and then your good.
I was wondering what would be a better cab IYO for a Dual Rectifier.
Mesa 4x12 Stand
Mesa 4x12 Trad
or
2 mesa 2x12's
???? Oh and please leave a reason.