3Q/331E
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ClassTransmitting Triode
Construction
Primary TypeTriode
EnvelopeWater-Cooled
SectionsSingle-ended
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage17500 V
Plate Dissipation160000 W
Cathode Current16000 mA
Audio Performance
Power Output185000 W
Key Features
- Water-Cooled Anode
- Tungsten Filament
- High Power RF Amplifier
- Single-ended
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Frequency Amplifier (Balanced 2-valve) | 12500V | 61333.33 | 750 | 46 | 12400mA |
| Class B Telephony Radio Frequency | 17000V | - | - | - | 1000mA |
| Class C Power Amplifier (Anode Modulated) | 12000V | - | - | - | 11000mA |
| Class C Amplifier or Oscillator (Unmodulated, Condition 1) | 12000V | - | - | - | - |
| Class C Amplifier or Oscillator (Unmodulated, Condition 2) | 17000V | - | - | - | 15000mA |
Application Notes
Air cooling required for filament and grid seals at a pressure of 2in. SWG (5 cu. ft./min). Operating voltage marked on bulb.
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