So what does anyone know about John Birch pickups?
I used to sell John Birch guitars back when they were frist popular, and so I have played most of the pickups. I also have a 1971 J1 Deluxe, with superflux G's and Tim played it when he was here recently. I asked him about making a pickup that would recreate the sound, but I think it is not easy!
All John Birch guitars were maple neck through, with maple wings. This makes them a bright guitar. The pickups are narrow with 9 screws in each polepiece row.
This document tells you all the types that he made.