6S4P-DR = EC86 = PC86 tube. High-frequency triode
The 6S4P-DR (6С4П-ДР) high-frequency high-transconductance triode has been designed for use in grounded-grid circuits of input and wide-band amplifiers.
The 6S4P-DR high-frequency triodes is are miniature devices enclosed in glass bulb and are provided with a nine-pin base and an indirectly heated oxide-coated cathode.
The 6S4P-DR high-frequency triodes are resistant to ambient temperature from -45 to +70°C and relative humidity of 95 to 98% at +25°C, as well as to mechanical loads: vibration loads up to 2g and multiple impact loads up to 15g.
All tubes new in box, military equipment and have "OTK" mark. Near equivalent: EC86 and PC86. The tube is manufactured by the Reflector plant, Saratov, Russia.
Type: HF triode,hi-durable,long-life
Application: UHF voltage amplification in grounded grid circuit
Cathode type: oxide,indirect heating
Envelope: glass, miniature
Mass, g: 15
Filament voltage, V: 6,3
Filament current, A: 0,275-0,325
Anode voltage, V: 150
Anode current, A: 0,011-0,019
Anode power, W: 3
Steepness, mA/V: 15,0-24,0
Reverse grid current, uA: 0,05-0,3
Microphnic noise, mV: 10
Socket type: rsh8
All datasheets here.