BR 137B
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BrandMarconi
ClassTransmitting Triode
Construction
Primary Typetriode
EnvelopeForced-air-cooled
Sections1
Filament / Heater
Materialtungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation20000 W
Audio Performance
Key Features
- Forced-air-cooled
- Tungsten filament
- External grid and filament seal cooling required
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF Amplifier/Oscillator | 6000V | - | - | 43 | 2000mA |
| HF Amplifier/Oscillator | 10000V | 35000 | - | - | 1500mA |
Application Notes
The anode requires forced air cooling; temperature must not exceed 180°C. Grid and filament seals require approx 20 cu. ft. per minute air flow; seal temperature must not exceed 140°C. Air cooling supplies must be operational before applying supply voltages and continue for one minute after removal.
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