My supersonic 22 makes a popping noise when switching between channels. Is this a problem in the design or just my unit?

Solution 1, that's BS. This is a known issue with this amp - and one with a remedy here:http://brownoscillator.com/wordpress/?p=...

In fact "Joe" who works for the Brown Oscillator Company in Seattle says:
"I added another mute actuator circuit that responds to the switching direction seemingly overlooked by the designers.?"

It's basically an oversight by the designers at Fender - who obviously don't test these amps in real world scenarios. Don't fret Michael, the fix works, and Joe even posted a schematic on the problem. — I'm convinced anything like these issues can be fixed.

Don't forget, Fender is in business to make a profit, it's no different than the house building industry. When there's an incentive to cut corners because of profit - you'll get the short end of the stick - always. It's still a fantastic sounding amp, but they could have been more diligent in a few areas. No one wants a noisy, popping or humming amp. Solution 1, that's BS. This is a known issue with this amp - and one with a remedy here: http://brownoscillator.com/wordpress/?p=8 In fact "Joe" who works for the Brown Oscillator Company in Seattle says: "I added another mute actuator circuit that responds to the switching direction seemingly overlooked by the designers.?" It's basically an oversight by the designers at Fender - who obviously don't test these amps in real world scenarios. Don't fret Michael, the fix works, and Joe even posted a schematic on the problem. — I'm convinced anything like these issues can be fixed. Don't forget, Fender is in business to make a profit, it's no different than the house building industry. When there's an incentive to cut corners because of profit - you'll get the short end of the stick - always. It's still a fantastic sounding amp, but they could have been more diligent in a few areas. No one wants a noisy, popping or humming amp.