Tube-number record
2C40
0 archive entries
2C40 is a tube type in the TubeDatabase archive (class: Lighthouse Triode). Recorded specifications: brand RCA, year 1945, construction Triode, base Metal, socket Octal, maximum plate voltage 500 V, and maximum plate dissipation 6.5 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassLighthouse Triode
BaseOctal
Filament6.3 V @ 0.75 mA
Construction
Primary TypeTriode
EnvelopeLighthouse
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesUnipotential Cathode
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 Type
- Unipotential Cathode
- High Frequency RF Amplifier
- Disc-seal construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250 V | 4850 | 7500 | 36 | 17 mA |
Application Notes
Tube should be supported by its metal shell and not by its base or other terminals. Under extremely high ambient temperatures, the plate-seal temperature must never exceed 200°C.
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