Mesa Boogie Triple Rectifier Solo Head pooping noise

[Wtomtsmarc]

Hello all. I am new to this forum and I have a question about my Mesa Triple Rectifier. Ever since I've had it it has made this popping noise when switching between channels. Any ideas of what the cause and fix may be?

[defaced]

The Rectos have a channel muting circuit that kills the output of the amp during channel switching. If that circuit doesn't trigger at the proper time, you get to hear the pop. Sometimes its a loud pop, other times is quiet. How loud is the pop? I had a Triple Rec for a while and only occasionally would there be a loud pop, for the most part it was quiet.