Microphones schematics and documents

Posted on Feb 5, 2014

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
Click here to download the full size of the above Circuit.

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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