Fantastic 1972 Silverface Twin Reverb came in looking a bit sorry for itself with a metal grill. I Serviced and modified her and now will nor let her go.. my own No 1 Amp: Full recap of all electrolytics Circuit modded to AB763 specs (Blackface) Normal Channel Modded to a Tweed Bassman tone stack (more gain and not so much mid scoop) Reverb and Vibrato added to the Normal Channel Original RCA tubes kept but bias modified to be able to adjust bias on each tube individually (not a matched set at all) Master Volume Removed and a “Soul” Control added (so you can adjust negative feedback) adjusts the whole attitude of the amp 2x Eminence Legend 1258 speakers replaced the too knackered Pyle Speakers Most of the preamp tubes needed replacing (they gave out or became noisy during testing) New grill cloth put on 2 more handles added to make the amp more “portable”