10

Vacuum Tube Type: 10, Filament / Heater: 7.5V at 1.25A, Pin Count / Base: 4-Pin Bayonet (UX4), Description: Legendary vintage directly-heated power triode utilized in antique 1920s/1930s high-fidelity audio power output stages, amateur transmitters, or instrumentation amplifiers. Equivalent: RCA UX-210 / Sylvania 10 / Cunningham CX-310 / National Union 10