Looking to build a '72 SL with master volume and FX loop mods. I'm looking at the 12 series chassis at Valvestorm, but am wondering which you guys prefer, the one that fits the Belton sockets, or the one that fits the Amphenol sockets. Those chassis use a laydown PT. Which brands/models do you prefer? I figured I'd get the chassis and iron out of the way first. I've built several amps from kits, but have never sourced the pieces individually. I've heard there's some laydown transformer mojo, but I have no experience there. I had a '72SL years ago that Demeter put a master volume on and it sounded amazing, so I'm trying to recreate that.