Tube-number record
TH 515
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BrandTHOMSON-CSF
ClassTransmitting Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
SectionsSingle
Filament / Heater
Materialthoriated tungsten
Warm-up Time120s
Absolute Maximum Ratings
Plate Voltage40000 V
Plate Dissipation65000 W
Grid 1 Voltage-1500 V
Cathode Current1000000 mA
Audio Performance
Key Features
- Vapor-cooled
- Pulsed RF amplification
- Concentric electrode terminals
- Thoriated tungsten cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Pulsed RF power amplifier | 37000 V | 170000 | — | 50 | 200000 mA |
Application Notes
Heater voltage must be applied in two stages: 10V for 1 minute, then 20V for 1 minute. Air flow must be on before heater and maintained for 10 minutes after shutdown.
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