Tube-number record
TB 3/350
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BrandPhilips
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation100 W
Grid 1 Voltage-250 V
Cathode Current225 mA
Audio Performance
Key Features
- Thoriated tungsten filament
- Directly heated
- H.F. or L.F. amplifier or oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. class C telegraphy | 3000 V | — | — | 38 | 167 mA |
| H.F. class C telegraphy | 2000 V | — | — | 38 | 167 mA |
| H.F. class C anode modulation | 2500 V | — | — | — |
Application Notes
Mounting position: vertical with base up or down.
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