Chubbs
Well-known member
Hey guys, picked up a mesa mark 3 DRG recently and noticed the graphic eq is always in despite the switch being in auto, out, or in. The previous tech did replace the caps and a eq slider, but everything looks to be done very well and correctly. From looking at the schematic it looks like there may be diodes, transistors, ldr’s, and or vactrols in play, perhaps a failure somewhere causing this problem. Not sure if this is common or if they’re any way to test these components but figured I’d ask, I’m a bit out of my element coming from Marshall’s.