At your risk.
It happened almost by chance.
An inductor of 100mH was connected in series with a capacitor of 100nF. So both in series between SM58 and preamplifier recorder Sony TC-D5M.
Signal path: male voice singing When I Fall in Love - Nat King Cole in the same key as Nat - Shure SM58 at 24in, 30 degrees above head - 100mH in series with 100nF - Sony TC-D5M - TDK SAX cassette - TC-D5M (reproducing) - Pleiades 2N3053 power amplifier - Celestion Ditton 150
It sounded very nice with no bass emphasis, the capacitor corrects bass emphasis by low cut. The inductor may possibly remove some mid emphasis? and does not seem to cut high frequency content. This is possibly because the core may be a mu-metal one spare from a Coles 4038 internal mic transformer. As frequency increases the permeability decreases. So inductive reactance may not be proportional to frequency.
Other combination that worked fine is 100mH in parallel with 220nF and total in series between microphone and recorder.
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