Tube-number record
GL1
0 archive entries
GL1 is a tube type in the TubeDatabase archive (class: Triode Thyratron). Recorded specifications: brand FERRANTI, year 1955, construction Triode, base Ceramic, socket Octal, and maximum plate voltage 1250 V. The archive does not yet hold a photographed example of this type.
BrandFERRANTI
ClassTriode Thyratron
BaseOctal
Construction
Primary TypeTriode
Rectifier TypeMercury-Argon
EnvelopeGlass
Base MaterialCeramic
Sections1
Filament / Heater
Materialoxide coated
Warm-up Time15s
Absolute Maximum Ratings
Plate Voltage1250 V
Grid 1 Voltage-500 V
Cathode Current1500 mA
Audio Performance
Key Features
- Mercury-Argon filled
- Directly heated cathode
- International Octal base
- Ceramic collar top cap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Control Characteristics | 25 V | — | — | — | — |
| Control Characteristics | 500 V | — | — | — | — |
| Control Characteristics | 1250 V | — | — | — | — |
Application Notes
It is essential to connect one side of the filament supply to both pins 1 and 2, and the other side to both pins 7 and 8.
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