Tube-number record
TB3/750
0 archive entries
TB3/750 is a tube type in the TubeDatabase archive (class: RF Power Triode). Recorded specifications: construction Triode, socket 5-pin, maximum plate voltage 4000 V, and maximum plate dissipation 350 W. The archive does not yet hold a photographed example of this type.
ClassRF Power Triode
Base5-pin
Construction
Primary TypeTriode
Envelopeglass
Sections1
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation350 W
Grid 1 Voltage-900 V
Cathode Current500 mA
Audio Performance
Typical THD2.5%
Power Output1550 W
Key Features
- Direct heating
- Thoriated tungsten filament
- Class C Telegraphy
- Industrial Oscillator
- Grounded grid
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy | 4000 V | 5000 | — | 25 | 380 mA |
| Class C Telegraphy | 3000 V | 5000 | — | 25 | 363 mA |
| Class B Modulator (per tube) | 4000 V | — | — | — | 270 mA |
Application Notes
In cases where maximum permissible temperatures are likely to be exceeded (above 30 MHz), low-velocity air flow is required on the anode seal and envelope bottom.
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