Here's another Plexi Build. This is modeled after a 1967 Marshall Pexi "The First JMP" with a 1202-80 Power Transformer and a 1202-119 Output Transformer with a 1700 impedance. All Mustard Capacitors and Mullard EL34 Xf4 and Mullard 12AX7.
Basically identical to the Black Flags, these amps are easily recognizable by having a “JMP” faceplate and sometimes also a polarity switch on the front (especially on US models). Like the last Black Flags, these models used 470K mixer resistors. Both 1202-119 and 1202-132 output transformers are used. Serial numbers are still in the 10.000 range.

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