I’ve seen this on the Albrecht AE-5900 and although I know 100% nothing about it this needs the world to see it. It’s an item of genius really

Modification of the original microphone
Have a nice Sunday. The next modification is successful. Compressor/Noice Gain amplifier from ELV is installed into the original microphone of the Albrecht AE5900 SSB. It then brings a bit more punch to the SSB and is particularly well suited for DX. With the 3 pots, you can set the volume, compressor, and noice gain separately.


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Any clue to as what compression/noise gate board this is?
Absolutely none at all
Here you find the source with a PDF of crafting Instructions.
https://de.elv.com/p/mikrofonspezialist-mikrofonverstaerker-mit-kompressor-und-noise-gate-smv5-2-P251598/?itemId=251598
Look -> https://de.elv.com/p/elv-bausatz-smd-mikrofonverstaerker-version-2-smv5-2-P154613/?itemId=154613 and docu ->https://media.elv.com/file/154613_km.pdf