These are vintage, NOS (New Old Stock) parts, and were removed from unused equipment. Microphone is two piece aluminum construction. Top has conical shape as shown in photos. Two back terminals are marked + and _. The minus terminal is connected to the case. Their are 2 short length wires soldered to the terminals. Their are no other markings on the part, and we have no other data or specifications for these. As shown in the photo, they have been tested to be functional. Microphone measures a nominal 1.90 inches in diameter (48.3 mm), 0.52 inches thick (13.2 mm), excluding terminals. Great for radio and electronic project experimenter use, vacuum tube circuits, music uses; anywhere a high impedance microphone is required. Unusual and hard to find item. See our other listings for a smaller crystal mic.
![]()
|