It is not known yet if this is due to air core or the by product of high resistance associated with inductance.
One can also wind to a high permeability core and then connect a series resistor.
Anyway this is how air core inductors tested.
Signal path:
Male voice singing Swett Harmony - Beloved - Shure VP64 at 1-2in - Danbridge decade inductor box D13A - Sony TC-D5 Pro - Sennheiser HD580
The hum is tremendous, see previous post. Perhaps connecting 2 D13A in series anti phase would solve the problem.
But the sound is very nice and smooth without anything disturbing at the bass register.
300mH was found best. The coil resitnave at that point in about 166Ω.
When 100mH is used the sound is a obviously thinner. But the sound of 1x100mH is many times better than 10x10mH. This is because in the latter case resistance is much lower. And it sounds not only thin but midrange honkytonk.
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