This was perhaps one of the first Pleiades filter experiments, about 10+ years ago?
A tiny ferrite ring core, it's outer diameter smaller than a pencil?, was used with just about 25 turns. Light blue color, Philips? The wire used was an orange wirewrap.
The inductance was only 1.11 Henries.
It was connected inside the Shure SM58 Mexico microphone by unscrewing the body of the mic.
It was connected in parallel with the low impedance voice coil before the internal Shure step up transformer.
The sound was very nice and bright at even 1in from mouth.
The drawback was that it was a permanent cutoff frequency soldered setup.
Setup, signal path:
Male or female singing voice at 0-1in - SM58 capsule - 1.11mH Pleiades filter - SM58 internal transformer stepping up to 200Ω - Sony TC-D5 Pro operated in mono - TDK type II cassette
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