Heathkit Microphone connectors

[Doug Shields]

Hello all,
    I know that the microphone connector on Heathkit transmitters is the 2 pin female (on the radio panel) type.  I have seen many SB-104 radios with a 4-pin male connector.  Was this 4-pin connector ever a standard factory part or am I just finding a lot of modified rigs?  Thanks very much.

Doug  W4DAS
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