6AF4

Miniature 7-pin medium-mu triode engineered with extremely short internal lead lengths to act as a local oscillator operating in the 470–890 MHz UHF television spectrum. Equivalents: 6AF4A. Real-Life Examples: Zenith round-screen color TVs (chassis 25MC20), RCA Victor console TVs, Blonder-Tongue BTU-2s standalone UHF converters.