Tube-number record
250
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ClassPower Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeST-19
Base MaterialPhenolic
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage450 V
Plate Dissipation20 W
Audio Performance
Power Output4.6 W
Key Features
- Large power amplifier triode
- High output for early audio systems
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 450 V | 2100 | 1800 | 3.8 | 55 mA |
Application Notes
Commonly used in early radio power stages and high-fidelity audio equipment from the late 1920s.
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