Yes exactly.danman wrote: ↑Sun Jan 20, 2019 6:54 pmEither circuit will be easily changeable. Marshall actually used the same boards for the 1987 and 2204 circuit for many years as their are only a couple different components between them. Most of the difference lies in the wiring of the input jacks because the 2204 routes the hi channel back through the lo input after it goes through the first half of v1. It then further amplifies the signal in the second half of v1 before heading to v2. Neils layout looks like you would need the four hole chassis (1987) to follow his layout so I would probably build the 1987 first. The loop and ppimv will work fine with it also if you decide to add one later.
That version there is designed to be a mod of a 1987 that someone can do easily.
If you were to go for much more gain in the front end there is an alternative lead dress version, slightly trickier and more invasive (if using a PCB version) but not difficult with a 4 holer and turret board.