Marshall JCM 900 100watt dual reverb 4100 model w/ 4×12 marhsall ( 1960 cabinet) -*sold* Marshall JCM 900 tube amp, 100 watt dual reverb, 4100 model w/ 4×12 Marshall ( 1960 cabinet). you want rock n’ roll here it is! one more cabinet would make it a monster rig. *Sold*