![Microphone design STC 4021 apple and biscuit omnidirectional mic circa 1935. Photo taken at the BBC archive a cou… | Vintage microphone, Vintage ads, Sound engineer Microphone design STC 4021 apple and biscuit omnidirectional mic circa 1935. Photo taken at the BBC archive a cou… | Vintage microphone, Vintage ads, Sound engineer](https://i.pinimg.com/736x/87/cc/cd/87cccd012fb709582e2d885d1c604e82.jpg)
Microphone design STC 4021 apple and biscuit omnidirectional mic circa 1935. Photo taken at the BBC archive a cou… | Vintage microphone, Vintage ads, Sound engineer
![STC 4021 (Apple & Biscuit) 1935-1960s One of my all time favourite mics! | Martin Mitchell's Microphones STC 4021 (Apple & Biscuit) 1935-1960s One of my all time favourite mics! | Martin Mitchell's Microphones](https://martinmitchellsmicrophones.wordpress.com/wp-content/uploads/2012/04/stc-4021-1-30percent.jpg?w=640)
STC 4021 (Apple & Biscuit) 1935-1960s One of my all time favourite mics! | Martin Mitchell's Microphones
![Biscuits and secret messages: The intriguing history of WW2 BBC technology - National Science and Media Museum blog Biscuits and secret messages: The intriguing history of WW2 BBC technology - National Science and Media Museum blog](https://blog.scienceandmediamuseum.org.uk/wp-content/uploads/2015/07/stc-4021-apple-and-biscuit-547.jpg)
Biscuits and secret messages: The intriguing history of WW2 BBC technology - National Science and Media Museum blog
![STC 4021A Antique Ball & Biscuit 1930's Microphone for Sale in BLACKBURN, Victoria Classified | AustraliaListed.com STC 4021A Antique Ball & Biscuit 1930's Microphone for Sale in BLACKBURN, Victoria Classified | AustraliaListed.com](https://images.australialisted.com/nlarge/stc_4021a_antique_ball_biscuit_1930_s_microphone_21094034.jpg)
STC 4021A Antique Ball & Biscuit 1930's Microphone for Sale in BLACKBURN, Victoria Classified | AustraliaListed.com
![Mike & Liese on X: "Awesome day @TheGrandChapel today... Vintage 70s #drumkit including Black Beauty snare, stunning basses & a REDDI, and a Ball & Biscuit #microphone to play with 😁😊. (Sorry, Mike & Liese on X: "Awesome day @TheGrandChapel today... Vintage 70s #drumkit including Black Beauty snare, stunning basses & a REDDI, and a Ball & Biscuit #microphone to play with 😁😊. (Sorry,](https://pbs.twimg.com/media/FKyTPNuWQA4EJB5.jpg:large)