SONY Condenser Microphone Brochure
probably from around October, 1978
Four pages in length, this publication contains information and specifications for the ECM-16, ECM-18, ECM-33P, ECM-99, ECM-170, ECM-220, ECM-250, ECM-270, and the ECM-280. This is a 640-kb color PDF, formatted for 8½ × 11-inch printing. Here’s what you will get:
