Instrument is a Geonics EM16 VLF receiver, using in the mineral exploration industry to find buried linear conductors.
this post was submitted on 16 Oct 2024
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The instrument is fully analogue, designed in the late 70s. The serial number on the device implies it was manufactured in 87. I contacted the manufacturer and the last person who could service it has long since retired, but they sent me the calibration and tuning documents so I might be able to revive this beauty.
That's actually awesome they sent you anything useful at all.