Tube-number record
9T40
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9T40 is a tube type in the TubeDatabase archive (class: High Power Vapour Cooled Triode). Recorded specifications: brand NEC, construction Triode, base Metal/Glass Coaxial, socket Coaxial, maximum plate voltage 15000 V, and maximum plate dissipation 150000 W. The archive does not yet hold a photographed example of this type.
BrandNEC
ClassHigh Power Vapour Cooled Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeVapour Cooled
Base MaterialMetal/Glass Coaxial
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier and Modulator - Class B (Max Signal) | 14600 V | 80000 | — | 40 | 30000 mA |
| RF Power Amplifier - Class C Telephony (Carrier) | 12000 V | — | — | — | 14500 mA |
| RF Power Amplifier and Oscillator - Class C Telegraphy | 15000 V | — | — |
Application Notes
The tube features ring-sealed terminals providing low lead inductances for stable high-frequency operation. Forced-air cooling is required for the stem and glass bulb in addition to vapour cooling for the anode.
Datasheets
Datasheet: 9T40.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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