242A
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BrandWestern Electric
ClassFilamentary air-cooled triode
BaseW.E. 112A
Construction
Primary Typetriode
Envelopeglass
Sectionssingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation85 W
Cathode Current150 mA
Audio Performance
Typical THD5%
Power Output18 W
Key Features
- Filamentary air-cooled triode
- Audio-frequency amplifier
- Radio-frequency amplifier
- Modulator
- Oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio | 1250V | 3600 | 3500 | 12.5 | 60mA |
| Class A Audio | 1000V | - | - | - | 75mA |
| Class A Audio | 750V | - | - | - | 100mA |
Application Notes
If mounted horizontally the plane of the filament should be vertical. A free circulation of air must be provided to insure adequate cooling of the glass.
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