2 General Electric 6U8A/6678 Triode Pentode VHF Radio/Television Mixer Oscillator Audio Vacuum Tube Valve- Bangybang.tubeBrand General Electric Model 6U8A Type Triode pentode by designation but is constructed as a beam tetrode Use Vf 6. 3 Volts If 0. 45 Ampere Indirect Parallel series AC DC Used in VHF radio and television between 80 MHz to 220 MHz. Bands II and III. The valve would be used as a mixer with the triode as local oscillator Similar Equiv 6678 6KD8 5KD8 Condition New in Box (NOS) Tubes per listing 2 06UXXX