The high version sounds almost correct to listener's brain as it seems to have an internal input transformer of low primary inductance acting as a Pleiades filter cutting exaggerated bass.
Signal path, setup:
Sony F-96 High - Pleiades V4 prepreamp - Realistic disco mixer at mic in - Sennheiser HD580
The Pleiades V4 electron tube prepreamp was powered by just 3.7V.
It may be the quitest prepreamp on the planet, there was almost no hiss but the signal output was not very high due to the mic output impedance being 10KΩ. Useful signal is lost (an input transformer could step it up more) as the input impedance of the V4 prepreamp is 100KΩ.
The Sony F-96 low is 600Ω.
At male singing voice again from 1in it sounded bass heavy to listener's brain.
A suitable Pleiades filter to low cut the exaggerated bass was of inductance of 53.5 milliheries.
It then sounded as balanced in sound as the F-96 High version.
The signal was much stronger as the transformer used was a 1:14.5 ratio.
The mic shined with its excellent high frequency and transient response. Loud sound, no hiss noise.
Signal path, setup:
Sony F-96 Low - Pleiades 53.5mH - Canford inline input transformer of 400mH primary inductance - - Pleiades V4 - Realistic disco mixer at mic in - Sennheiser HD 580
Actually by considering 2 inductances in parallel with the mic, 53.5mH in parallel with 400mH the actual needed shunt Pleiades inductance is less than 53.5mH.
This is good news as this requires very few primary winding turns on the input transformer.
If a Magnetec Nanocrystalinne Nanoperm core such as 073, 070, 059, 060 etc is used it should ba a joy to wind a world class high turn ratio Pleiades input transformer that makes the mic sound loud and flat in frequency responce from singer's vocal chords to listener's brain.
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