Tube-number record
4251-A
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BrandStandard
ClassTriode
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation1000 W
Cathode Current600 mA
Audio Performance
Power Output130 W
Key Features
- Thoriated tungsten filament
- Constant voltage type
- A.C. filament heating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A A.F. Amp. and Mod. | 2500 V | 3800 | 2750 | 10.5 | 240 mA |
| Class A A.F. Amp. and Mod. | 2000 V | 3800 | 2750 | 10.5 | 300 mA |
| Class B A.F. Amp. (2 valves) | 3000 V | — | — | — |
Application Notes
Curves taken with A.C. filament heating, voltages referred to centre point.
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