Machatsch km3 schematic?

[duantro]

Hi, I’m back with another oddball mic that I’m finally getting around to building a power supply and testing out. Looks like a cmv style mic with a similar m55 type capsule. Ef86 tube. Someone said this mic is an East German Machatsch km3. Output trnsformer was in the power supply so I’ll have to sort that. It has a 3 pin connector, so perhaps one pin has heater voltage, one pin is ground, and one is signal+ as well as b+ that would go to a coupling cap and output transformer inside the psu? I’ll start in tracing as best as I can. Anyone familiar with this, or happen to have a schematic?

 

[Lampie519]

http://mikrosammler.de/Helmut_MACHATSCH

 

[duantro]

Thanks, I have seen that page, but don’t find any schematics

 

[Lampie519]

RFT did something similar, a seperate transformer between PSU and mic.

 

[duantro]

Nice! I’ll study that. Interesting that they still have a 5 pin connector being used.