Tube-number record
3R/202S
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BrandITT
ClassIndustrial Triode
Construction
Primary TypeTriode
EnvelopeGlass-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
- Water-cooled
- Integral water jacket
- 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 (Condition 1) | 6000 V | 32000 | — | 12 | 2500 mA |
| Class C Industrial Heating R.F. Oscillator (Condition 2) | 6500 V | 32000 | — | 12 | 3000 mA |
| Class B A.F. Power Amplifier (Balanced 2-valve) | 5000 V | — | 2700 |
Application Notes
Specifically designed for industrial heating applications. Requires forced-air-cooling of grid and filament seals to below 180°C (approx 50 ft3/min). Surge peak current should be limited to 2.5 times the normal r.m.s. working value.
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