Mai jos este o descriere de pe "The Valve Museum".
The ECC85 is the definitive double triode for the front end stages of FM radio receivers. It was designed specifically for the purpose and released in 1954.
The two independent valves are screened by a rectangular plate across the diameter of the envelope. One triode would be used as an RF amplifier and the other as the local oscillator. The oscillator would be run 10.7 MHz lower than the incoming signal, and in the mixer a standard 10.7 MHz IF would be produced.
It was popular in the late 1950s to add an FM radio board to a television receiver as well as to make dedicated Band II receivers.
