I have been planning another RR800V Build for some time now. The original design from Rob Robinette was posted here: https://www.tdpri.com/threads/jcm800-6v6-6l6-el34-in-a-princeton-reverb-chassis.947374/ Some thoughts that went into this build: I wanted to have the option of adding time based effects after the preamp distortion, so I added a tube driven effects loop that can be fully bypassed in case I hate it. https://www.tdpri.com/threads/tube-driven-effects-loop-and-other-questions.1006952/ I wanted to be able to have the amp head close to my pedalboard for easy access to tweaking and short cable runs for 4 cable method. My thought was I could put the speaker cabinet wherever with the only long cable run being the speaker cable. This led me to an unorthodox over/under split chassis with knobs accessible from the top. Not a friendly configuration to build, but I took a shot at it. I wanted the inputs on the front side and the power and speaker on back. The main circuit is pretty much the same as the one I built previously in a Fender Twin cabinet. Two channels mixed in with 270k mixing resistors. No internal switching. I was originally going to try some channel switching, so I shoehorned in a DC power supply to be driven off of the 6.3V tap or the unused 5V tap. I abandoned the channel switching but kept the power supply in case I change my mind later. It just drives the pilot light at the moment. The power chassis is on the bottom and the chassis on top has the preamp and effects loop. I am running wires between the upper and lower through copper conduit. One for heaters, one for B+4, one for preamp line out and one for the ~5V DC power supply. I will add a picture of the chassis assembly that is taking shape. The volumes and tone stack knobs will be on cover strips on the top chassis (not drilled yet). Wish me luck!