>I have some OLD FC-30 chokes in metal boxes with 4
>terminals on each end.
> One had a bad internal connection so I pried open the box
> and found that it
> was made of ferrite or powdered iron toroids not ferrite
> sticks.
>
The one I opened looked like they stole loopstick antennas
from a 1960's 6 transistor AM radio.
It had a whole pile of little flat ferrite cores that were
wide and thin and long all bonded together and thick
insulation wire (not even magnet wire) wound around it.
I was so unimpressed I never used another one.
73 Tom
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