Tube-number record
TBL 12/40
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TBL 12/40 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Philips, construction Triode, base Metal, socket Special / none, maximum plate voltage 13000 V, and maximum plate dissipation 15000 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassTriode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass and Metal (Forced Air Cooled)
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. class C telegraphy | 12000 V | 25000 | 1320 | 33 | 4500 mA |
| R.F. class C anode modulation | 10000 V | — | — | — | 3500 mA |
Application Notes
Used as R.F. or A.F. amplifier or oscillator. For frequencies higher than 4 Mc/s, specific grid lead connection is required to ensure uniform R.F. current distribution.
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