bandit2013 said:How old is the amp?
The popping noise, is it common? Yes... it is common but you are not supposed to be hearing it. That being said, the switching logic for channel changes was designed to have a strobe mute circuit that is supposed to momentarily disconnect the signal path in two positions (just before the PI and just before the EQ section). If the strobe mute does not function you will hear the effect of channel switching though the speaker (same effect you get when you move the toggle switches to change voice settings and sometimes you will hear a pop when turning on the bright switch on CH3 if it was off. Popping noise has not been much of an issue with the Mark V as it can be on the Roadster (uses a similar technique to quench the disconnect of circuit paths during channel changes). With the Roadster, one trick was to cycle all channels after power up and standby off, and most important to activate the mute switch (usually has the loudest pop) and once that is done, the popping noise from channel changes is minimum or not at all apparent. You may want to cycle the channels on the footswitch as well as turn on an off the mute and see if that works to prevent pop noise when changing channels. If the issue is persistent I would contact Mesa Service and see what they can tell you or perhaps you amp needs a minor repair.
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