Tube-number record
3J/221S
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3J/221S is a tube type in the TubeDatabase archive (class: Air-Blast-Cooled R.F. Power Amplifier Triode). Recorded specifications: construction Triode, maximum plate voltage 17500 V, and maximum plate dissipation 10000 W. The archive does not yet hold a photographed example of this type.
ClassAir-Blast-Cooled R.F. Power Amplifier Triode
Construction
Primary TypeTriode
EnvelopeGlass and Metal
SectionsSingle
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage17500 V
Plate Dissipation10000 W
Cathode Current2500 mA
Audio Performance
Key Features
- Air-Blast-Cooled
- Tungsten filament
- Peak emission 12A
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 12000 V | 8965.5 | 2900 | 26 | 1500 mA |
| Class B Telephony Modulated Carrier | 15000 V | — | — | — | 1000 mA |
| Class C Power Amplifier Anode Modulated | 12000 V | — | — | — |
Application Notes
For use as R.F. Power Amplifier or Oscillator. Required volume of air at 3 in. water pressure is 475 cu. ft./min for 10 kW dissipation.
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