I have a collection of WL93 mics of different vintage. Is there a method to tell the older ones from the newer ones?
To determine the WL93 version, measure the resistance between the red wire and the black wire. Connect the red wire to the + lead on ohm meter; the black wire to the - lead on ohm meter.
1) Measurement result = Approximately 700 to 800 ohms - older version of WL93.
2) Measurement result = Approximately 18.6k ohms - newer version of WL93.