242B
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BrandWestern Electric
ClassFilamentary air-cooled triode
BaseLarge four-pin bayonet
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMetal/Phenolic
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation100 W
Cathode Current150 mA
Audio Performance
Typical THD5%
Power Output22 W
Key Features
- Air-cooled
- Thoriated tungsten filament
- High power triode
- Graphite anode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Condition 1) | 1250V | 3600 | 3500 | 12.5 | 68mA |
| Class A Audio Amplifier (Condition 2) | 1000V | 3600 | 3500 | 12.5 | 85mA |
| Class C RF Oscillator | 1250V | - | - | - | 150mA |
Application Notes
The tube may be used as an audio-frequency amplifier or as a radio-frequency amplifier, modulator or oscillator. For horizontal mounting, the plane of the filament should be vertical. A free circulation of air must be provided to insure adequate cooling.
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