janarn

The Lead and Super Lead models 62 - 81:

Model 1987:
JTM-45 MkI prototype
JTM-45 MkII: The JTM-45 for sale 62 - 66
JTM "reverse logo" (50w with EL34) late 66 - mid 67
JMP Plexi mid 67 - mid 69
JMP Metalface mid 69 - 81 (up to '84 some places)
Tremolo model 65 - 75

Model 1959:
JTM-45/100 with KT66 introdused November 65. The last of them changed to EL34 tubes.
JTM "reverse logo" late 66 - mid 67
JMP Plexi mid 67 - mid 69
JMP Metalface 69 - 81
Tremolo model 65 - 73

JTM MkIII was the 50w Super PA model 1963 (the only JTM50)
JTM Mk IV was the Tremolo version
JTM Mk V was the 100w Super PA model 1968 (the only JTM100)

Tube rectifier on the 1987 until early/mid '67, 100w never had it.