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#3
06-05-21, 09:39
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WS19 Headgear No.2 - this has the double-button "Tannoy" carbon microphone instead of the No.7 dynamic insert one. They were used for the Driver Intercom with Junction Distribution No.1 and No.2. (Basically because there were not enough circuits available through the rotary base junction in early tanks, so they needed an intercom that didn't require amplification - this way they only had to provide +12V, Ground, an intercom output ("Speech") and a buzzer call ("Signal") line, which could be done via two slip-rings in the junction.
Chris. 
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