the output jack on my K&K double big twin and the input jack on my pure preamp seem to be having troubles. It seems as if the jacks are loose, for the crappy sound is intermittent. A majority of the time, the sound WONDERFUL...the sound I fell in love with (thanks Bob!) but everynow and then it'll start get all scratchy and staticy I'll jiggle the jack and it'll go away, but come back. it was especially bad today at a gig I had. I couldn't get it to go away. I got so mad i just stopped playing and stormed off the band stand! I've tried tightening the nuts on the outside of the jacks, but no difference. what should i do? As a side note, it seems as if I get a better sound from the double big twin without the pure preamp when i turn on the 9-band EQ on my hartke HA3500.