I am listening but not hearing what I must in order to keep this preamp. It sounds as though it plays best when fed a diet of heavy metal not bluegrass. I have uncovered a volume attentuator problem that PCX can fix for $300, then if you add the upgrades and shipping I would have maybe almost $3000 in a machine over 10 years old. I want a tube amp that doesnt sound like SS. Any ideas?