Tube-number record
3B/401J
0 archive entries
3B/401J is a tube type in the TubeDatabase archive (class: U.H.F. Triode). Recorded specifications: construction Triode, socket Special / none, maximum plate voltage 1000 V, and maximum plate dissipation 40 W. The archive does not yet hold a photographed example of this type.
ClassU.H.F. Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeDouble-disc-seal
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation40 W
Cathode Current100 mA
Audio Performance
Power Output20 W
Key Features
- Double-disc-seal
- Thoriated tungsten filament
- Variable Wavelength Oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Oscillator | 800 V | 3000 | 2000 | 6 | 40 mA |
Application Notes
Variable Wavelength Oscillator, 34cm. wavelength upwards. RF power may be extracted by a pick-up loop. Outputs of approximately 20 watts may be obtained at wavelengths of 50 cm upward.
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