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Often it is referred to as simply Microphone Connector style, WPI connector, Heathkit Microphone Connector, and Amphenol Model # 80-75-MC1F. Although incorrect, other terms help to identify the connector. Search for 2501F, vintage mic connector, Heathkit mic, B&K signal generator cable connector as a few examples relative to equipment having this type of connector. In ham radio these connectors are typical of older rigs made before PTT (push to talk) was common. It is a very common 80 series microphone connector found not only in radios, but public address (PA) and audio systems of that era. HeathKit is commonly known to used this connector. Often it is referred to as simply "Microphone Connector," "WPI connector," "Heathkit Mic Connector," and "Amphenol Mini." Although incorrect, other terms help to identify the connector. Search for 2501F, vintage mic connector, Heathkit mic, B&K signal generator cable connector as a few examples relative to equipment having this type of connector. In ham radio these connectors are typical of older rigs made before PTT (push to talk) was common. It is a very common 80 series microphone connector found not only in radios, but public address (PA) and audio systems of that era. HeathKit is commonly known to used this connector.