I would like to have a "void free" birch plywood back panel made for my Marshall JCM 800 "1960 A" cabinet. Does anyone know of a builder who makes these as a replacement for the particle board stock back panel?
Jeff Swanson made one for my 1960TV. It fit perfectly but I hated the sound. The cabinet got too bright and too tight for my tastes. I went back to the original particle board back and am much happier.