[TenTec] Re: what is so special about heil microphone elements?

[Stuart Rohre]

Actually Bill, for mike use, you do not have to rigorously match the load to
the source impedance, if the load is as high as tube and early semiconductor
rigs were.  You wanted the load to be higher than the impedance of the mike.
However, now, many circuits are set up for 600 ohm mike inputs, and load
down the old higher impedance source crystal and dynamic mikes.  The
matching of impedances is used for power circuits like audio outputs while
mikes are voltage source devices, not current sources like high power audio
output stages and RF circuits for output stages.
73,
Stuart
K5KVH