6P1P-E = EL90 = 6AQ5 tube. Output tetrode
The 6P1P-E (6П1П-Е) output beam tetrode is designed for amplification of low-frequency power.
The 6P1P-E output pentodes are miniature devices enclosed in glass bulb and are provided with a nine-pin base and an indirectly heated oxide-coated cathode.
The 6P1P-E electron tube output 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 mechanical loads: vibration loads up to 10g and multiple impact loads up to 35g.
All tubes new, military equipment and have "OTK" mark. Near equivalent: EL82. And similar to the 6AQ5, EL90 and the 6V6. Because of a different pinout (a 9-pin base versus 7-pin base) than an 6AQ5/EL90.
The tube is manufactured by the Svetlana, St. Peterburg, Russia.
Name: 6P1P-E (aka 6P1P-E)
Type: Output beam tetrode,long-life
Application: LF power amplification
Cathode type: oxide, indirect heating
Envelope: glass, miniature
Mass, g: 20
Filament voltage, V: 6,3
Filament current, A: 0,45-0,53
Anode voltage, V: 250
Anode current, A: 0,033-0,055
Anode power, W: 12
Grid1 voltage, V: minus 12,5
Grid2 voltage, V: 250
Steepness, mA/V: 3,8-6,0
Reverse grid current, uA: 0,5
Microphnic noise, mV: 200
Socket type: rsh8
All datasheets here.