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6S51N
Triode for amplifying and generation.
Envelope: sub-miniature, metal-ceramic.
Mass 3 g.

General characteristics:

Type 6S51N 6S51N-V
Filament voltage, Volt 6.3 6.3
Anode voltage, Volt 80 80
Resistance in cathode circuit, Ohm 130 130
Type 6S51N 6S51N-V
Filament (heater) current, mA 130±20 130±20
Anode current, mA 9,5±2,8 10±2,5
Reverse grid current, mkA -- £0,1
Dissipate cathode-heater current, mkA £20 £20
Mutual conductance, mA/V 7,5 to 12 11±2,5
Gain coefficient 32±12 30±12
Input resistance, Kohm ≥7 ≥7
Equivalent noise resistance, Ohm -- £0,4
Vibration noise (by RA=2 KOhm), mV £40 £40
Inter electrode capacitance, pF:    
input 4,2±1,3 4,2±0,8
output 1,8±0,6 2,2±0,6
transfer £2,5 1,8±0,6
cathode-heater 1,4±0,4 1,4±0,4
Operation time, h 5000 2000

Limited operating values:

Type 6S51N, 6S51N-V
Filament voltage, V 5,7-7
Anode voltage, V 120
Grid voltage, V -55
Cathode - heater voltage, V 100
Cathode current, mA 15
Anode dissipation, W 1,2
Grid dissipation, W 0,2
Resistance in grid circuit, MOhm 1
Tubes temperature, ° 250

Operating environmental conditions :

Type 6S51N 6S51N-V
Acceleration of vibration loads, g 2.5 15
by frequencies, Hz 10-150 5-5000
Acceleration of multiple impacts, g 35 150
Acceleration of single impact, g -- 1000
Continuos acceleration, g -- 150
Ambient temperature, ° -60 to +125 -60 to +200
Relative humidity at up to 40 °C, % 98 98