Hey all, Just listened again to Eric Johnson's 1978 Album "Seven Worlds" and fell in love again with the Mark I! (It doesn't help either that I was watching the Mahavishnu Orchestra (Montreaux '74) DVD with JML playing two Mark I's!) EJ's Boogie rig AFAIK, is an early PTP 100w head into an 8 ohm Marshall 4x12 with G12-80's. FWIW, a Fender Reverb tank he hung off the back of the cabinet was used in the loop too! So I'm gassing for Mark I's! Princeton Reverb conversions (old school :AOK), Vintage PTP/PCB, Reissues... LET'S SEE 'UM! Thanks all!