Question about Fender SuperSonic 22 22W 1x12 Tube Guitar Combo Amp

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

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This would be expected. Very high quality audio equipment like mixers for instance will have a soft mute during changes... you just don't find that on any of the guitar amps... The popping is lost in the rest of the "noise". I won't go into the technical explanation other than any slight charge difference at switch contacts or electronic switches will generate a pop when the circuit is closed.

Posted on Mar 26, 2011

  • gretschjet May 10, 2011

    Solution 1, that's BS. This is a known issue with this amp - and one with a remedy here:

    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.



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I have answered some of this before, however I have reveiwed the schematic and as an electrical engineer I want you to do a couple tests.

First, plug in a set of headphones into the preamp out jack. Note that due to the impedance mismatch what you hear will not be very loud. Now change the state of the clean OD. Did you hear a faint pop?

Next plug a LOW impedance device OR even an instrument cable into the power amp "input" jack. Do this with the power off then warm amp up.
Now, change the state of the clean OD. Did you hear a faint pop?

Now for the analysis. If you did hear one in the first test and NOT in the second, the pop you are hearing is the "NATURE OF THE BEAST".

I can tell you from the design that the pop you hear is from coupling within the clean and OD relays within the unit. There is no cure for this within the unit other than find another brand...

I would recommend that you use an EXTERNAL pedal for the effects you want rather than trying to use the clean OD in this amp. I suspect it was never intended to be shifted during playing as I can guarantee it will pop when you shift while having anything other than dead silence (not even a bit of hum from your guitar). There is also statistical noise in the preamp that the laws of physics will not let us get around that may be enough to create a bit of a pop.

You could also use a volume pedal between the preamp output and the power amp in to throttle the volume to zero before shifting to OD.

In general I think you will find that what you are hearing is the nature of this beast.

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If you unit has a digital effects unit, probably the setting for that got disturbed and you need to reset it to your desired setting.

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