212E
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BrandWestern Electric
ClassFilamentary air-cooled triode
BaseW. E. 118A
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation275 W
Cathode Current350 mA
Audio Performance
Typical THD5%
Power Output50 W
Key Features
- Thoriated tungsten filament
- Air-cooled
- Large four-pin bayonet base
- Impedance classifications (#1 to #4) for parallel operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 2000V | 8500 | 1900 | 16 | - |
| Class A Audio Amplifier (1500V) | 1500V | - | - | - | 170mA |
| Class A Audio Amplifier (1250V) | 1250V | - | - | - | 200mA |
| Class B Audio Amplifier (2 tubes - 2000V) | 2000V | - | - | - | 300mA |
| Class B Radio-Frequency Amplifier | 2000V | - | - | - | 300mA |
| Class C Radio-Frequency Oscillator (Unmodulated) | 2000V | - | - | - | 300mA |
| Class C Radio-Frequency Amplifier (Plate Modulated) | 1500V | - | - | - | 300mA |
Application Notes
May be used as an audio-frequency amplifier or modulator; or as a radio-frequency oscillator or amplifier. If mounted horizontally, the plane of the filament should be vertical.
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