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6N15P, ECC91, 6CC31
Double triodes, used as an low frequency power amplifier and HF oscillator.
Envelope: glass.
Mass 12 g.

General characteristics:

Type 6N15P ECC91, 6CC31
Filament voltage, Volt 6.3 6.3
Anode voltage, Volt 100 100
Grid voltage, Volt -- -0.85
Resistance in cathode circuit, Ohm 50 --
Type 6N15P ECC91, 6CC31
Filament (heater) current, mA 450 450
Anode current, mA 9 8.5
Reverse grid current, mkA £2 --
Dissipate cathode-heater current, mkA 20 --
Mutual conductance, mA/V 5.6 5.3
Gain coefficient 38 38
Vibration noise (by RA=2 KOhm), mV £150 --
Inter electrode capacitance, pF:
input
 
2.2
 
2.2
output of 1st triode 0.45 0.55
output of 2nd triode 0.4 0.55
transfer 1.5 1.6
Operation time, h ³500 --

Limited operating values:

Type 6N15P ECC91, 6CC31
Filament voltage, V 5,7-7 5.7-6.9
Anode voltage, V 330 300
Cathode - heater voltage, V 100 100
Anode dissipation, W 1.6 1.5
Resistance in grid circuit, MOhm 0.1 0.5

Operating environmental conditions :

Type 6N15P ECC91, 6CC31
Acceleration of vibration loads, g 2,5 --
Acceleration of multiple impacts, g 35 --
Ambient temperature, ° -60 to +70 --
Relative humidity at up to 40°C, % 98 --