Hi friends, I'm 10 amplifier builds into my lockdown learning curve--I've learned so much, thanks to this and other forums, books, helpful sites like Rob Robinette's, and of course, the experience of doing it over and over! I've been modding the circuits I've built since the beginning, but now I'm starting to get even more creative in terms of repurposing chassis for different circuits. So, one of my recent builds was an AB763 Deluxe Reverb head--it sounds great, I had no troubles on startup outside of a bit of tremolo tick (easy fix with lead dress and a jumper capacitor) and 2(!!) ****ty new JJ tubes that crapped out on burn-in. I implemented a "lead" channel on the Normal channel per Rob's suggestions. The amp sounds great and complements my Princeton Reverb...the thing is, it's just too damn big. Almost all of my cabs are 1x12" (that's what I like), so I don't have anything wide enough to place the DR cab on top of, meaning it's on the floor, which is kind of driving me nuts....and it's got me thinking about building a single-channel AB763 DR that lives inside a Princeton Reverb chassis/head. I do like the sound of the "lead" Normal channel, but it's not a deal-breaker vs. a head that actually fits on top of my cabs. I know there's a Hoffman "single-channel DR" out there, but I'm more interested in faithfully (+mods) reproducing the AB763, sans Channel 1. Differences I know I'll need to address: Remove V1 and all board components, pots, etc. Is it sufficient to just remove the 220k "channel mixing" resistor that the normal channel hits before feeding the Phase Inverter grid? Add another preamp tube hole (pretty confident I can fit one in the wider space between V2 and V3 and shift the Reverb Driver "up one screw hole" to make room. Route the power transformer hole to fit a DR transformer Various holes to add the choke, cap pan, cover the cap can hole, etc. Anything else I missed? Here's my biggest question: does removing V1 and all of its board components necessitate any change to the filter cap that powers it? In Rob's layout and the Fender schematic, the far left cap (D) provides 280v to 3 nodes, powering plates for V1, V2, and V4. Will removing one of these tubes/nodes change anything? I'm learning more electronics fundamentals but have a ways to go on stuff like this.