Been living with my DC3 for a while and now that I am in a regular band practicing twice a week I am struggling with inconsistent sound.Sometimes the clean sound is perfect,the next time there is a lot of hissing.Sometimes the GEQ makes a big difference,other times it is unnoticable.As a test with no input I cranked both channels and switched the GEQ in and out,either way I could hear the results when moving the faders so the GEQ is always bleeding through.The amp is the version with 3 metal toggles on the front,the footswitch is a Peavey 2 button no LED's.It works but could it be a problem,Maybe the LDR's need replacing? I am also on my second set of JJ power tubes in 6 months. Does anyone have info on the proper biasing and making the bias adjustable?I want to love this amp but it is frustrating me,when its working well The clean channel and my OD pedals give just what I need, I find the lead channel useless it sounds flat and dull.HELP if you can!