Tube-number record
TBW 6/20
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TBW 6/20 is a tube type in the TubeDatabase archive (class: Transmitting Triode). Recorded specifications: brand Philips, construction Triode, base Coaxial terminals, socket Coaxial, maximum plate voltage 5500 V, and maximum plate dissipation 12000 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassTransmitting Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeMetal-ceramic/Glass
Base MaterialCoaxial terminals
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
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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