Tube-number record
TBW 6/20
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BrandPhilips
ClassTransmitting Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeMetal-ceramic/Glass
Base MaterialCoaxial terminals
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage5500 V
Plate Dissipation12000 W
Grid 1 Voltage-500 V
Cathode Current6000 mA
Audio Performance
Key Features
- Coaxial construction
- Thoriated tungsten filament
- Water cooled anode
- Designed for AM, FM and TV transmitters
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. class C telegraphy, grounded grid | 5000 V | 60000 | — | 60 | 4800 mA |
| H.F. class B telephony for television (CCIR/FCC) | 4000 V | — | — | — | 4380 mA |
Application Notes
The filament current must never exceed a peak value of 500 A during the initial energizing schedule. Cooling requires water circulation and additional air flow for seals, especially at higher frequencies like 220 MHz.
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