Tube-number record
GK40
0 archive entries
GK40 is a tube type in the TubeDatabase archive (class: Cold Cathode Triode). Recorded specifications: brand FERRANTI, year 1955, construction Other / special, base Glass, socket Special / none, and maximum plate voltage 140 V. The archive does not yet hold a photographed example of this type.
BrandFERRANTI
ClassCold Cathode Triode
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeGlass miniature
Base MaterialGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage140 V
Cathode Current20 mA
Audio Performance
Key Features
- Miniature dimensions
- Side grid connection
- Anode marked with red band
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Relay | 135 V | — | — | — | 0.001 mA |
Application Notes
The anode supply switch should be shunted by a resistor of approximately 30 megohms to prevent surge effects. Static bias may be obtained by connecting grid to anode supply through 1000 megohms.
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