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thanks for your advise !!

Hi Greg, Yes I swapped the tubes left channel and right channel with no effect, and it doesn't matter if there is an input cable plugged in. I appreciate your help

Hi, I'm looking for some advice on trouble shooting a crackle problem I’m having with my 20/20 things I have tried or observed.... - I only get a crackle on the left channel. (right channel is fine) - I cleaned the volume pot and presence pot, no effect - I changed all the tubes, no effect -...