It's
a two-wire capsule () -- AFAIK the ground
terminal is connected to the capsule body in that capsule. I
have continuity between capsule body and plug sleeve. It just
seems like the connection between the cable and the capsule
(maybe 5 or 6mm) where the wires are exposed is enough to admit
hum?
Not in normal circumstances. Are you sure that the body in which
you put the capsule is properly grounded?
No: there is no body -- well, no metal body; it's inside a
bakelite antique wall-mounted telephone mouthpiece. I was under
the impression that a 2-wire PiP capsule acts as its own shield so
I didn't need shielding, but apparently I'm wrong and the join
from cable to capsule does need to be shielded?
-c
