David Clark M-55 Amplified Electret Microphone
This is a direct replacement mic for the HBT Series Industrial Headsets - HBT-30 / HBT-40 / HBT-61
The Model M-55 is an Electret, noise-cancelling microphone designed to operate in place of carbon and amplified dynamic microphones. Provides clear, crisp voice transmission. It will not operate in circuits that do not supply a DC bias voltage. Most modern aviation communications equipment do supply this required voltage. If unsure, consult with your radio technical manual or with your local avionics shop.
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