Tube-number record
4081-A
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BrandStandard Valves
ClassTriode
Construction
Primary TypeTriode
Envelopeglass bulb with water-cooled anode
Sectionssingle
Filament / Heater
Materialpure tungsten
Absolute Maximum Ratings
Plate Voltage17500 V
Plate Dissipation20000 W
Audio Performance
Key Features
- water cooled triode
- pure tungsten filament
- constant voltage type filament
- single ended
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Test Condition | 16000 V | 5500 | 6000 | 33 | 1000 mA |
| Class B A.F. Amp or Mod | 17500 V | — | — | — | 1050 mA |
| Class B Telephony | 17500 V | — | — | — | 830 mA |
Application Notes
Single ended water cooled triode. Requires water jacket type PL 122.676. Normal water flow is 50 litres per minute with a pressure drop of 1.0 Kg. per sq. cm.
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