At auction: DESCRIPTION: Exceptional nickel-plated art deco carbon microphone from the 1920s-30s era by General Sound Equipment. Looking straight out of a Frank Capra movie, its classic styling consists of a center carbon microphone (stamped “General Sound Equipment”) suspended by eight springs within a large nickel-plated ring atop a vertically ribbed shaft. Stamp on base… Continue reading An RCA carbon microphone. Not all original, but one beautiful form.