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MESA TITAN V12 ISSUE (crackling, sputtering and pops)

Hi Everybody,

I'm Andres from Italy.

I'm a TITAN V12 owner, and it sounds GREAT!

For some time the amp has some problems: costant crackling, sputtering, some louder pops from time to time, noise is there with and without engaging overdrive, but louder when amplified from overdrive gain.

I'v just cleaned pre-amp board from dust and particles - disconnected front panel flat cable, cleaned socket - swapped preamp tubes one by one, each time turning on and off to check and cleaned tubes pins and tubes' sockets with isopropyl alcool - no bulging or leaks from capacitors.

Has anybody had a similar experience?

Thanks