Tube-number record
3R/187E
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BrandSTC
ClassIndustrial Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeMetal/Glass with Integral Water Jacket
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage6500 V
Plate Dissipation4000 W
Grid 1 Voltage-1500 V
Cathode Current2000 mA
Audio Performance
Power Output12000 W
Key Features
- Integral Water Jacket
- Thoriated tungsten filament
- Water-cooled industrial triode
- Efficient helical copper tube cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Industrial Heating R.F. Oscillator (Max Power) | 6500 V | 22000 | 545 | 12 | 1800 mA |
| Class B A.F. Power Amplifier | 5000 V | 22000 | — | 12 | 1900 mA |
Application Notes
Recommended to introduce resistance or reactance in filament supply to limit surge peak current to 2.5x normal. Vertical mounting required with anode downwards.
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