Microphones schematics and documents

  
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The power supply was built into the base of the mic which can lead to hum issues despite the on-board potentiometer that acts as a `null`. This also means that the mic has two cables running from it - one for power and one for audio. Both mics use two-stage head amplifiers based around an ECC83 tube, and both have unbalanced outputs. Here are the official schematics for the M1 and M4 mics.
Microphones schematics and documents - schematic

The M5 seems to have been the `Studio` version, with an external power supply and output transformer for balanced low impedance operation. I haven`t seen a factory schematic for the M5, but this is a drawing that I traced out from a specimen on the bench.



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