[GreenKeys] Thyratron used in audio ! !

[Larry Tighe]

Western Electric used the 297A thyratron for audio! !  It was used in the C.O. switch.
Panel and Stepper offices used a "cry baby" when a customer hit any digit with the
rotary dial that was not allowed.  Such a digit landing upon a vacant selector position,
for example, would route that customer immediately to the cry baby.  It would be the
297A connected to an R C network that keyed on a one second pulsing relay to ground.
Only old people will remember the cry baby   weeeee oooooh weeeee ooooooh.
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