9T40
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BrandNEC
ClassHigh Power Vapour Cooled Triode
BaseCoaxial Ring-Sealed
Construction
Primary TypeTriode
EnvelopeVapour Cooled
Base MaterialMetal/Glass Coaxial
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation150000 W
Grid 1 Voltage-1500 V
Cathode Current20000 mA
Audio Performance
Key Features
- Rugged coaxial construction
- Ring-sealed terminals
- Low lead inductances
- Thoriated-tungsten filament
- Vapour-cooled anode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier and Modulator - Class B (Max Signal) | 14600V | 80000 | - | 40 | 30000mA |
| RF Power Amplifier - Class C Telephony (Carrier) | 12000V | - | - | - | 14500mA |
| RF Power Amplifier and Oscillator - Class C Telegraphy | 15000V | - | - | - | 20000mA |
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.
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