I picked up three "TSM MT87S" condenser microphones. Any known mods that can be made to the circuit?

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dreamspace

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Nov 2, 2024
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Norway
Picked up three of these mics for a total of $100 locally, with shock mounts and cables. The TSM mics were, AFAIK, the white-label brand to some Scandinavian equipment dealer. I'm not entirely sure what the circuit is, maybe similar to the MXL 2001? I think the microphones are 15-20 years old.

Given that I paid next to nothing for them, I'm wondering if there are any relatively affordable mods (as in $50-$100 worth of mods for each microphone)? I have no experience with modding microphones, but I have a lot of experience with modding and building guitar amps, pedals, etc.

Here are some pictures

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