Pin 7 12AX7... cut the trace to the little white box that goes to the volume control, put in a 100K. or higher.. 1W resistor. cleans up .. and by that I mean less fizzi like.. less ugly.. distortion tones esp. when cranked. consider a cathode bypass switch... 1/2 power so less volume when driven hard. the thing is they are made to put out 5Watts Class A.. and that's pretty loud watts when you push it. It's not like a solid state amp where you can get whatever the freak tones they make at any volume. so 'low volume' winds up meaning different things to different people My champ puts out 4W, cranked it shakes the living room. But it's my damn house, so there. VVR can help a lot, but even then some complain they aren't getting the same exact tones as loud. ears is diabolical!