Telefunken - AC701k für Neumann Mikrofone Audio component

AC701k NOS tube red-dot version, manufactured @ TELEFUNKEN Werk / Ulm Germany. These absolutely rare tubes have been used in top-class NEUMANN microphones starting in 1954 starting with model M49, later on in model M50, M53 M54 and KM64. These microphones have been used all over the world be super stars of the music industry like Elvis Presley – letzte Session vor dem Militärdienst (10. Juni 1958, RCA Studio B), Gesang im M 49
Miles Davis, Bob Dylan, Simon & Garfunkel, Barbra Streisand, George Michael, David Bowie, Michael, Jackson Neil Young John Lennon