MARSHALL 6100 LM TUBE AMP - made in UK:* 3 channels* 100 watts* all tubes* back plate is missingThe 6100LM has three channels: Clean, Overdrive, Lead. The clean channel reproduces a JTM45 circuit. The overdrive channel, however, has three modes which work like the newer JVM models from Marshall. The first one is a reproduction of a JTM45 on slight breakup, the second is a 1959 plexi and the third one is aJCM900. The lead channel is a boosted JCM900.