I bought this Bassman cab on CL a while back and it sat around while I decided what to make it into. I finally decided to make a JTM45/BB combo but with a 15" Celestion Fullback. The cab was originally cut for 2 10" speakers but the cab just seemed too big for that. I always wanted to make a 15" combo and this would be perfect for that, so out came the jigsaw! Power transformer is an old mil-spec unit with correct specs. OT is from an old 60s PA amp, also with correct windings for a BB. I used WMF film/foil caps which are about the only polyester film/foil types still made. KT66 tubes and a GZ34 rectifier. The neat thing about this amp is that since the BB is basically the exact circuit as the '59 Bassman, I put 2 speaker jacks on the back so I can have it BB spec or Bassman spec. Only difference between the 2 amps is OT primary impedance and NFB resistor. I also put a standby switch on the front where I can select between tube or SS rectification.