Tube-number record
3J/222E
0 archive entries
3J/222E is a tube type in the TubeDatabase archive (class: Industrial Triode). Recorded specifications: brand Standard Telephones and Cables Limited (ITT), construction Triode, maximum plate voltage 7000 V, and maximum plate dissipation 10000 W. The archive does not yet hold a photographed example of this type.
BrandStandard Telephones and Cables Limited (ITT)
ClassIndustrial Triode
Construction
Primary TypeTriode
EnvelopeExternal Anode
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage7000 V
Plate Dissipation10000 W
Grid 1 Voltage-1500 V
Cathode Current6000 mA
Audio Performance
Key Features
- Forced-Air-Cooled
- Thoriated-tungsten filament
- High mutual conductance
- High efficiency
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Industrial Heating R.F. Oscillator | 6000 V | 60000 | — | 16 | 5600 mA |
Application Notes
Specifically designed for industrial heating applications. Filament surge current should be limited to 2.5 times the normal working value.
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