The 5CG8 is a 9-pin miniature compound tube containing a medium-mu triode and a sharp-cutoff pentode in a single envelope. Designed primarily for VHF oscillator-mixer and IF service in television receivers and multi-band radio front-ends, it operates on a 4.7V/600mA series heater with controlled warm-up time. It was regularly specified in late-1950s series-string chassis manufactured by RCA Victor, Zenith, Philco, and Sylvania. Available in NOS and tested used conditions.