STC 4021A Apple and Biscuit Microphone with original box

Tested, working STC 4021C microphone, complete with original box

The STC 4021C is a vintage, omnidirectional moving-coil (dynamic) microphone, also known by the nickname "Ball and Biscuit". Developed by Standard Telephones and Cables (STC) in the 1930s, it has a distinct vintage tone and is a collector's item. Features and history

• Distinctive design: The microphone's shape, consisting of a spherical head and a round base, earned it the "Ball and Biscuit" nickname. The BBC reportedly called it the "apple and biscuit" mic.
• Omnidirectional pattern: The 4021C is an omnidirectional microphone, designed to pick up sound equally from all directions. This made it useful for "round table" discussions in radio studios.
• Military use: During World War II, a version of the 4021C with an iron grille was reportedly used for locating enemy aircraft.
• Western Electric connection: STC was the British subsidiary of Western Electric, and the 4021C is similar to the Western Electric 630A microphone.
• Construction: The microphone is known for its robust and sturdy construction. It is made of metal, and the diaphragm is a delicate piece of very thin aluminum.
• Sonic characteristics: The 4021C is valued for its unique, "gritty vintage" sound.
• Modern usage: Today, the 4021C is used by some recording studios for its unique sonic qualities. It is valued for vocals, drums (as a "crush mic" or room mic), and guitar amps.
• Notable users: Artists like The White Stripes and Phil Collins reportedly used this microphone.