Went to an estate sale of an audiophile / electronics engineer that had a lot of interesting stuff. I was attracted to the sale by the R2R decks but they were very expensive. Found a bunch of empty reels though, both 7" and 10", plastic and metal, so that was nice. Best single item was a Neumann SM69 stereo tube microphone, with the NSMa23 power supply, anti-shock mount as well as swivel mount, and two long cables. This is an item I bought out of curiosity only to find it is quite famous and valuable! It is not something I want to turn on, but all the other items I got from the sale were functional so this probably is as well. I wonder if there is a tech on the forum that specializes in these sorts of things? It doesn't seem the type of unit I'd take to a regular stereo repair shop.
I'm also curious how the audio signal is connected to from the power supply? There is a connector with blade connections, but I did not see such a connector at the sale and it wasn't in with the other items. I am planning to go back tomorrow and rummage around to see if I can find the connector, but if anyone knows what I should be looking for it would help.
Here's the whole group of Neumann items I got today:
View attachment 3849083
Edited to add: I found a receipt from 1993 showing the owner paid $297 for the elastic anti-shock cage, and $427.50 for the 31ft cable !!
Edited to add: I went back to the estate sale second day and picked up a bunch more stuff including an unbuilt Heathkit Inverter, a box of audio-related manuals and brochures (still need to sort through), a bunch of great books (including one on Microphones!), and most importantly, the missing
stereo output and power cables for the NSMa23 power supply! Also found another 31ft Neumann cable, and a microphone stand. At this point I have everything needed to test the microphone, and I'm considering powering it up to see if it works. Will report back.