Tube-number record
TBL7/9000
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TBL7/9000 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Philips, construction Triode, maximum plate voltage 8000 V, and maximum plate dissipation 6000 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassTriode
Construction
Primary TypeTriode
Envelopeglass/metal
Sectionssingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage8000 V
Plate Dissipation6000 W
Grid 1 Voltage-1250 V
Cathode Current1800 mA
Audio Performance
Key Features
- Thoriated tungsten filament
- Forced air cooling
- Industrial R.F. generators
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF class C oscillator | 7200 V | 12000 | 2000 | 24 | 1500 mA |
| RF class C oscillator (alternate) | 6200 V | 12000 | 2000 | 24 | 1440 mA |
Application Notes
At frequencies above 4 Mc/s both grid terminals should be connected in parallel to distribute R.F. current equally and avoid excessive seal temperatures.
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