The Sony Model ECM-990F
one-point stereo electret condenser microphone

Photos by Nathalie Gosselin, The Rangefinder Reg’d.

Specifications are from the Sony ECM-990F Instruction Manual, available immediately below.

Download the ECM-990F Instruction Manual.
Courtesy of John Kompogeorgas, SV1BKJ.

Download the ECM-990 Service Manual.
Courtesy of Torben Larsen.