[ARC5] MC-385-D and a BC-221-D Question

[Robert Eleazer]

According to the "bible" (1973 Fair Radio catalog), the MC-385-D adapts 4000 ohm to 600 ohm and is a High to Low adapter.

This makes perfect sense given the radio output impedances used in WWII, enabling you to plug a 600 ohm headset into your BC-348 without changing the tap on the audio output transformer.

I have one, NIB.  And given that Fair was selling them for 50 cents used and 75 cents new, I suspect that a great many were taken apart to enable the phone plugs and jacks to be employed for various nefarious purposes.

By the way, I have a BC-221-D, made by Bendix, 1941 contract date, mounted in a BC-221-AK case.  There is a large ceramic core coil with many many turns in 4 windings hanging below the detector tube socket.  It's come disconnected at one end.  And I am not sure it is original, either.  Anyone have clue where this thing goes or if it's even supposed to be there? The set looks pretty original, otherwise.

Thanks,
Wayne