Tube-number record
3J/202E
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3J/202E is a tube type in the TubeDatabase archive (class: Industrial Triode). Recorded specifications: brand ITT, construction Triode, socket Special / none, maximum plate voltage 7000 V, and maximum plate dissipation 6000 W. The archive does not yet hold a photographed example of this type.
BrandITT
ClassIndustrial Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass and Metal
SectionsSingle
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage7000 V
Plate Dissipation6000 W
Grid 1 Voltage-1500 V
Cathode Current3000 mA
Audio Performance
Power Output12000 W
Key Features
- Forced-Air-Cooled
- Thoriated-tungsten filament
- Industrial RF Heating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C RF Oscillator | 6000 V | 32000 | — | 16 | 2500 mA |
| Class C RF Oscillator | 6500 V | 32000 | — | 16 | 3000 mA |
| Class B AF Power Amplifier | 5000 V | — | 2700 | 16 | 1900 mA |
Application Notes
Recommended to introduce resistance or reactance into filament supply to limit surge current to 2.5 times normal value.
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