6F4P = ECL84 = 6DX8 = 6DQ8 tube. Triode-Penthode
The Pentode part of the 6F4P triode-pentode is designed for operation in output stages of video and LF amplifiers ant it's triode part is suitable for use in Varios AGC circuits and as a LF preamplifier in Television and broadcast receivers.
The 6F4P triode-pentodes are miniature devices enclosed in glass bulb and provided with nine rigit leads and an indirectly heated oxide-coated cathode.
The 6F4P triode-pentodes are resistant to ambient temperature from -60 to +70°C and relative humidity of 95 to 98% at +40°C, as well as to vibration with an acceleration of 12 g.
All tubes new, military equipment and have "OTK" mark. Near equivalent: ECL84, 6DX8 and 6DQ8 .
The tube is manufactured by the Oktjbr', Vinnitsa, Ukraine.
Application: as output videoamplifier or LF preamplifier
Cathode type: oxide,indirect heating
Mass, g: 20
Filament voltage, V: 6,3
Filament current, A: 0,65-0,79
Anode voltage, V: triode-200/penthode-200
Anode current, A: triode-0,003/penthode-0,018
Anode power, W: triode-1/penthode-4
Grid1 voltage, V: triode-minus1.7/penthode-minus2
Grid2 voltage, V: 200
Steepness, mA/V: triode-4/penthode-10,4
Reverse grid current, uA: 0,3/1
All datasheets here.