Hello! I have a few questions about new and older SVT-2 PRO heads. What has changed in controls, new amp compared to 1991 built one? I've noticed that SVT-2 has more knobs nowadays. Has the basic sound of this amp changed from 1991 built model (compared to new SVT-2)? Of course better adjustment possibilities make possible more sounds but how about the "basic sound"? I know this is not an easy question.. What I'm often thinking is also that is it possible to get overdrive from both of these amps (new and 1991 built)? I've heard lots of good about SVT-2's overdrive knob but what I don't know is if it's the same thing in old and new amps. Is there any common failures in new or older SVT-2 heads? Thank you!