7F8 High Frequency Twin Triode Tube. Designed for use as a grounded grid radio frequency amplifier or as a frequency converter at frequencies up to 300 mc. MFR: GE, RCA, Tung Sol.
7F8 SYLVANIA Audio Vacuum Tube Valve - Bangybang
7F8 / CV2968 Tubes double triodes de puissance HALTRON
Sylvania etc. Pair (2) 7F8 Double Triode (like 12AT7) Loktal TESTED Vacuum Tube Audio 1945-1955 | Reverb France
RCA 7F8 - NessTone Tube Sales
Radio Tubes 7F8 Sylvania Faded Logo NOS PAIR | eBay