I have an E-Mu Tracker pre, and after I got out from the hospital (got my christmas here, it was horrible ), my guitar broke records in hum (almost as loud as my playing). I trought my "new" hi-fi amplifier (I use modelling instead of tube amps, works fine for me, the amp was brought used by my father as a christmas present) is the problem but after I disconnected it, still did the terrible noise in my headphones. I even rewired the guitar and got an another cable for testing. But when I plugged the cable into the second input, everything was fixed: I got back the noiselessness of my custom pickup.
Can I somehow fix it? All I know my stepfather made my room (he has multiple OCDs) and disconnected the guitar cable from the soundcard. And I can solder it or can get a friend to change the input connector.