My guitar amp fm212 when i plug input jack makes popcorn noise, when i plug the guitar cable make hudge noise like pumping ur popcorns pumping.... when i take the jack of finish, i tested several jack cables and diferent channel amp even the pre in and makes same noise,...
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Sounds like you either have a jack that has broken the solder connections to the circuit board or a piece of a plug came off and is stuck inside the jack or else you have a jack that the plug is just too loose due to age and slight bending of the parts that make contact inside the jack. Of course it might just be a bit of corrosion in the jack. I am assuming of course that the “popcorn” sound goes away when there is nothing plugged into that jack.
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This does sound like bad jacks, no noise with nothing plugged in, same noise with different cables plugged in. I would replace the jacks with high quality parts.
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true when theres nothing plug in theres no noise, only when i plug any cable even working one i`ve tested in other amp, does that sound like popcorns…. will try to replace the input jack piece.
by filipeyakuza