Hey Guys, I built a platform amp based on a JTM45 (KT66) and now I want to experiment with Mods to shape the tone of the amp. More like "Voicing" Mods. I'm curious as to what are your favourite mods. So far I've split the cathode at V1 to make it more plexi like. 0.1µf coupling caps at the output to fatten the tone a bit. 50/50µf power cap and solid state rectifier to tighten the feel. 32/32µf PI and 16µf preamp power cap. 500pf/33k at the tone stack. Put an 12AT7 at PI to tame the harshness. Not really interested in a PPIMV or Cascading the preamp. This amp has more than enough gain for what I do (70's Classic Rock). I looked at the Friedman mods he's done, like the C45 mod (works best with the extra preamp tube HBE). Not sure if it will work with this amp which doesn't have the extra gain stage and isn't cascaded? The Sat mod never sounded good to me. His Fat switch is nice for single coils (easy to do). The one I'm interested in is his structure switch mod. Does any know what that does? Mods I'm considering ATM: 1) Cathode switch at V2 with different Resistor/Bypass Cap combos 2) Some kind of presence feedback mod on a switch. 3) ?? So, I'm pretty slim on ideas. Can anyone chime in on other ideas on ways to voice the amp? Thx..