Hola! I took inspiration on a re-design of the Bass channel of my Bassman from @robrob, Hasserl, the amp-guy who used to write for Premier Guitar and this guy: If anyone is interested in going through my chicken-scratching to check the concept, I would appreciate it. Basically, the objective is to revise the Bass channel on a 68 SF Bassman (I can't remember the circuit variant, but I had already worked on Normal channel several years ago so it's not quite stock). The goal is a 2204-esque channel utilizing the unused part of V2 as a Cathode Follower and re-routing the tone stack after it ala Marshall. Marshall schematics have 470k mixer resistors between stages but Hasserl left them out in a schematic I have from him. Curious what people think of that, specifically the omission of a 470k feeding V1b after the 1M gain pot (I am intrigued at the possible extra gain). Also, sort of torn whether to add a PPIMV or not. If I do it, I wouldn't want to do anything but the Type 3. I guess it's easy enough to test, but I am interested to know what people think of the Type 3. My particular amp was a "rescue" so it does have several holes drilled out in the back that I covered up when I un-modded it. I can use those for Gain, Presence and PPIMV pots. Fortunately, the front has been left unmolested and I'd like to keep it that way, so don't worry.