First keyers... remember the Mon-Key?
A pair of dual triode 12AU7s. One triode
of one tube produced dits while the other
produced dahs using a multivibrator circuit.
The other tube, one triode drove a speaker
while the other drove a keying relay.
Dits and dahs were not self-completing, so
it was tricky to hold the dah paddle down
until the timing was completed, otherwise
a zero might come out as a nine.
de Joe, aa4nn
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