Tube-number record
GL-921
0 archive entries
GL-921 is a tube type in the TubeDatabase archive (class: Phototube). Recorded specifications: brand General Electric, construction Other / special, socket Cartridge, and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassPhototube
BaseCartridge
Construction
Primary TypeOther / special
Sections2-electrode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage90 V
Audio Performance
Key Features
- Cartridge-type
- Gas-filled
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Relay and Light-Measurement | 90 V | — | — | — | — |
Application Notes
The GL-921 is a cartridge-type, two-electrode gas-filled phototube for relay- and light-measurement applications. It is useful in applications where space is restricted.
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