I ordered a 5F1 kit and am looking forward to it. Anyone know of great mods or enhancements for this amp? I was listening to a youtube video on it and started getting ideas like maybe making one of the resistor values switch selectable (for a tight/normal/loose option). Just wondering if anyone here has played with these amps a lot. I use a Tremoverb and like slightly overdriven AC30 cleans. Never tried a Champ or played through a Fender tube amp but it sounds like it nails some old Tom Petty tones pretty well.