Tube-number record
2C40-A
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2C40-A is a tube type in the TubeDatabase archive (class: Planar Triode). Recorded specifications: brand General Electric, construction Triode, socket Planar / disc seal, maximum plate voltage 500 V, and maximum plate dissipation 6.5 W. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassPlanar Triode
BasePlanar / disc seal
Filament6.3 V @ 750 mA
Construction
Primary TypeTriode
EnvelopeLighthouse
SectionsSingle
Filament / Heater
Heater NotesCoated Unipotential
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation6.5 W
Grid 1 Voltage-50 V
Cathode Current25 mA
H-C Voltage90 V
Audio Performance
Key Features
- Lighthouse construction
- Planar electrode arrangement
- Integral cathode RF bypass capacitor
- Low loss envelope
- Coaxial circuit compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 250 V | 5100 | — | 35 | 17 mA |
| Radio-Frequency Oscillator | 250 V | — | — | — | 20 mA |
Application Notes
Designed for use as a CW oscillator, radio-frequency amplifier, or plate-pulsed oscillator at frequencies as high as 3370 megacycles.
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