I used to have a number of these because you could buy them from Fair
Radio for something like 2 for 50-cents at one time. If you have one in the
original packaging, you can read the sheet that was packed with them which
says something to the effect that one needs to experiment with placement for
best results. It goes on to say that people with varying larynx structures
will have different amounts of success using the T-30. On my fuller figured
throat, I was never able to find a position where it was anything but
muffled. If you take it apart, you can see part of the problem. That hard
plastic button is about 1/8-inch thick, and not likely to pass anything like
useful high frequencies. The little element inside is actually kind of
bright and tinny. I made a couple of microphones using that element and the
case and diaphragm from the R-14 earphone element from the HS-23? Or was that
22? The Hi impedance standard AAF headset anyway. These worked rather well,
had good output, and as good or better voice quality than a telephone F1
button.
At Dayton last year someone was trying to sell a modern throat
microphone made with modern materials. They were uncomfortable,
inarticulate, and bassy. In other words, a lot like the T-30!
Bob Bruner
WB4TAJ/9
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