Tube-number record
GL-891
0 archive entries
GL-891 is a tube type in the TubeDatabase archive (class: Pliotron Transmitting Tube). Recorded specifications: brand General Electric, construction Triode, base Metal/Insulator, maximum plate voltage 15000 V, and maximum plate dissipation 7500 W. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassPliotron Transmitting Tube
Construction
Primary TypeTriode
EnvelopeWater-cooled Anode
Base MaterialMetal/Insulator
Sections1
Filament / Heater
MaterialTwo-unit type
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation7500 W
Grid 1 Voltage-3000 V
Cathode Current2000 mA
Audio Performance
Typical THD5%
Power Output22000 W
Key Features
- Water-cooled anode
- Double-filament type
- Transmitting tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio-Frequency Power Amplifier | 8000 V | — | — | 8 | 900 mA |
| Class B Audio-Frequency Power Amplifier (2 tubes) | 10000 V | — | — | 8 | 3200 mA |
| Class C Radio-Frequency Power Amplifier - Telegraphy | 10000 V | — | — | 8 | 1450 mA |
Application Notes
The GL-891 can be operated at frequencies as high as 1.6 megacycles at maximum ratings. Operation up to 20 MHz is possible with reduced plate voltage and power input.
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