6F3P = 6BM8 = ECL82 tube. Gold-platinum grid
The 6F3P triode-pentode is designed for operation in low-frequency amplifiers and in vertical sweep stages of television receivers having a kinescope beam deflection angle of 70 to 110.
The 6F3P triode-pentode are miniature devices enclosed in gless bulb and provided with a nine-pins base, rigid leads and an indirectly heaten oxide-coated cathode.
All tubes new, military equipment and have "OTK" mark. Near equivalent: 6BM8 and ECL82.
Application: LF amplification and in TV scan modules
Cathode type: oxide, indirect heating
Filament voltage, Volt: 6.3
Anode voltage of triode, Volt: 170
Grid voltage of triode, Volt: -1.5
Anode voltage of pentode, Volt: 170
1st grid voltage of pentode, Volt: -11.5
2nd grid voltage of pentode, Volt: 170
Resistance in cathode circuit, Om: 680
Mass, g: 25
All datasheets here.