GK40
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BrandFERRANTI
ClassCold Cathode Triode
BaseStandard clips (caps)
Construction
Primary TypeGas-filled valve
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 | 135V | - | - | - | 0.001mA |
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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