This was found again by accident.
(It may happen on balanced microphones too.)
(A female to male XLR adaptor with polarity or phase change is very useful).
While trying to connect the recently described 3 pin DIN connector mics to Pleiades V4...
The input of the Pleiades V4 is 1/4in jack.
So short crocodile cable clips were used to quickly connect any such mic to the pre preamplifier input. There is almost none hum problem as the Pleiades electron tube pre preamplifier operates with 3 AAA batteries so there are no nasty power supply electromagnetic fields around.
The white crocodile cable was always connected to the V4 chassis ground.
It is usual to connect it to the centre pin of the 3 pin DIN mic connector but sometimes it was not. So the microphone was connected the other way round. The shield of the mic cable was made live.
It is best to experiment to find which sounds best.
The undesirable connection sounded bass heavy and for voice and singing it gave a lack of definition or muddy sound.
When the crocodile clips were swapped the difference was a great increase in clarity and decrease of the unnatural bass heavy sound perception.
This effect took place on most of the mics tried.
The SONY F-96 omni sounded much preferable when connected the "wrong' way. The balance of the sound was much clearer or closer to a world class beyerdynamic M55.
Setup (signal path): Various mics - 2 crocodile cables - inline 1/4 500Ω to 50KΩ input transformer - Pleiades V4 (EF183, 3.6V battery) - Realistic disco mixer mic input - Sennheiser HD 580
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