Tube-number record
838
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BrandGeneral Electric
ClassPower Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMetal shell
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation125 W
Cathode Current175 mA
Audio Performance
Power Output250 W
Key Features
- Thoriated-tungsten filament
- Air cooling
- High amplification factor
- Zero-bias Class B operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Frequency Power Amplifier | 1250 V | 3900 | 20000 | 78 | 90 mA |
| Class B Radio Frequency Power Amplifier (Carrier) | 1500 V | — | — | — | 132 mA |
Application Notes
All apparatus should be arranged to allow free circulation of air around the Pliotron. The bulb becomes very hot during operation. For metal base, the metal shell must not be connected to any part of the circuit. Return leads should be connected to the center tap of the filament-transformer secondary. To prevent parasitic oscillations, a noninductive resistance of 10 to 100 ohms should be placed in series with each control-grid lead.
Datasheets
Datasheet: 838.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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