It sounded great with a very relaxed and full spectrum sound.
For this preliminary experiment a bBC transformer of 2:1 was used so the mic becomes a 50ohm mic. The inductances 382mH:115mH.
Signal path, setup:
MD211N - BBC 2:1 transformer - V6 with 1:10 input transformer with 140mH primary inductance - Sony TC-D5 Pro - HD580
The bass was restored as expected compared to connecting directly to the V6 with 140mh input inductance.
Note that 2 transformers are connected one after the other on the above signal path. The effective ratio is 1:5.
Transformers are strange creatures. They sound great even when one feeds the other.
Why should they not. They are like 2 almost perfect analog reel to reel recorders feeding one
another.
Next both transformer were unplugged and the following transformers were tryied on their own.
A German inline type referred to at other posts, 200mH, 1:15. The sound was somewhat harsh and too much controlled or constrained.
A Canford inline of 400mH and 1 to 14. The sound was full and nice. it seems the Md211 likes a much higher input inductance tat the MD21.
A 300mH, 1:10 sounded very nice.
Conclusion:
For some reason the 2 transformers one after the other gave the most relaxed sound...
A good experiment would be to build a Pleiades 1:5 or 1:3 transformer with the classic Magnetec 070 ring core. What should be the optimum inductance for correct sound to listener"s mind?
Or otherwise stated for flat frequency respomse from singer's vocal chords to listener' s brain.
References
Pleiades V6 schematic
The Loye, Morgan paper for flat frequency response to listener's brain
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