Tube-number record
TBL 2/500
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BrandPhilips
ClassU.H.F. Power Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeCeramic
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage2700 V
Plate Dissipation500 W
Grid 1 Voltage-300 V
Cathode Current400 mA
Audio Performance
Key Features
- Forced air cooled
- Ceramic envelope
- Coaxial arrangement of terminals
- U.H.F. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristics | 2400 V | 14000 | 5000 | 70 | 240 mA |
| Grounded grid, f=400 Mc/s | 2500 V | — | — | — | 380 mA |
| Grounded grid, f=625 Mc/s | 2200 V | — | — | — | 380 mA |
Application Notes
Mounting position: vertical, with the anode up or down. Filament voltage varies by frequency: 3.4V (<600 Mc/s), 3.3V (600-750 Mc/s), 3.2V (>750 Mc/s).
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