David, Thanks, again, very much, for all your information on this mic, and Schoeps general history. I look forward to reading your book.
Like you, I'm not particularly into the whole 'social media' thing. I do have a Twitter account (though have never twitted and don't plan to) which I only use for early notification of equipment listings on a particular used broadcast gear sales list and finding out which suppliers will be at various farmers' markets locally. I'll have a look for the Schoeps posts you mentioned.
Numbers on bits of old equipment always intrigue me. As they went to the trouble of stamping/engraving them, it'd be interesting to know what the 28 and 88 mean, even if it's just an internal parts reference of some sort.
Reading at the information you posted I'm very glad I didn't bother trying to trace out the circuit! It'd be fairly straightforward on a PCB but, with the point to point construction and density, it would be a bit of an exercise. I'll get a power supply for it and see what happens but if it doesn't work then I think I'll just keep it as a curiosity to look at and be impressed by the patience of the person who built it.
I keep forgetting about the team boards on here; I should probably have posted my query in there. I'll look in on them a bit more as I do like a good geek-out.
Thanks for the kind words about the pictures but the credit really should go to the nice people at Samsung who built and programmed the camera side of my phone. I do have a couple of digital cameras - just a fixed lens compact and a zoom bridge camera - but my other cameras are still stuck in the age of film in various formats and, as the phone seems to be able to produce quite useful pictures in good light, and easily can squirt them onto my NAS drive, I used that for convenience.
P.S. Incidentally, this morning, I came across a couple of interesting articles by one Rémy Lafaurie in the french magazine Sound Review from June and October 1964. Entitled "New contributions to the technique of solid-state electrostatic microphones" and "New solid-state condenser microphones from Schoeps" which talk about the CMT and include a circuit diagram, some technical discussion about how it works and some tech details of capsules, power supply, etc.. It's a little way down a thread on the
Audiovintage.fr forum. There's also some interesting pictures and other stuff about mics used by/developed with ORTF (the broadcaster, not the mic technique)