Well......it's not the jack. Basically if I eliminate the Purple wire (CA) which I confirmed touches the Tip of the cord when cord is inserted and touches nothing when not,....the amp will work fine on a simpler two wire jack AND the original jack less the (CA) circuit. So the problem lies within that (CA) circuit? Correct? I tried to physically follow that circuit but got lost in the process to many times. (Seeing cross eyed now) :loco What next?... to keep the full features of the input jacks.