Tube-number record
4047-B
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BrandStandard Valves
ClassWater Cooled Triode
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
MaterialPure tungsten
Absolute Maximum Ratings
Plate Voltage13000 V
Plate Dissipation10000 W
Cathode Current1500 mA
Audio Performance
Power Output13200 W
Key Features
- Water cooled
- Pure tungsten filament
- Single ended
- Side-mounted grid lead
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | — | 5300 | 7500 | 40 | 750 mA |
| Class B AF Modulator (2 valves) | 10000 V | — | 7500 | — | 1200 mA |
| Class B Telephony | 10000 V | — | — | — | 750 mA |
Application Notes
The grid lead has been brought out through the side of the bulb. Identical characteristics to 4047-A but requires new grid connectors (ES.5706-I).
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