SONY C-37A MICROPHONE AND PSU (TESTED)
Note 1: The item for sale is around 60 years old. To switch between the directional modes the following procedure can be used: If an audio test of the mic indicates the mic is in the non-directional (Omni) mode, turn the screw to the left (counter clockwise) for the uni-directional (Cardioid) mode; if an audio test of the mic indicates the mic is in the uni-directional (Cardioid) mode, turn the screw to the right (clockwise) for the non-directional (Omni) mode.