RCA Victor Produced and Duplicated more Half Track (2 Track) Prerecorded Tapes in the 1950s than any other company and continued into the 60s and 70s with quarter track and a Very Extensive catalogue.

RCA’s 1950’s production started by using RT-21 quarter-inch tape recorders running at 30 IPS, wired to mono mixers with Neumann U-47 cardioid and M-49/50 omnidirectional microphones.

A few years later, they switched to an Ampex 300–3 one-half inch machine running at 15 IPS and later increased it to 30 inches per second.