6N9S = 6SL7 = 6SU7 = ECC35 tube. Double triode
The 6N9S double triode is designed for amplification of low-frequency voltage.
The 6N9S double triodes are enclosed in glass bulb and are provided with an octal base and an indirectly heated oxide-coated cathode.
The 6N9S double triodes 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 2.5g and multiple impact up to 35g.
Best Quality, the Sound is nice - authentic vintage tone
All tubes new, military equipment and have "OTK" mark. Near equivalent: 6SL7, 6SU7 and ECC35.
The tube is manufactured by the Reflector, Saratov, Russia.
Filament voltage, Volt: 6.3
Anode voltage, Volt: 250
Grid voltage, Volt: -2
Resistance in cathode circuit, Ohm: --
Filament (heater) current, mA: 300
Anode current, mA: 2.3
Reverse grid current, mkA: 1
Dissipate cathode-heater current, mkA: 20
Mutual conductance, mA/V: 1.7
Gain coefficient: 70
Vibration noise (by RA=2 kOhm), mV: 400
Inter electrode capacitance, pF:
- input: 2.5
- output: 1
- transfer: 4
Operation time, over h: 1500
Limited operating values:
Filament voltage, V: 5,7-7
Anode voltage, V: 275
Cathode - heater voltage, V: 100
Anode dissipation, W: 1.1
Resistance in grid circuit, MOhm: 0.5
Operating environmental conditions:
Acceleration of vibration loads, g: 2,5
by frequencies, Hz: 10-150
Acceleration of multiple impacts, g: 35
Ambient temperature, °С: -60 to +70
Relative humidity at up to 40°C, %: 98
All datasheets here.