Tube-number record
RS 870
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BrandSiemens
ClassModulator Triode
Construction
Primary TypeTriode
Envelopeglass/metal/ceramic
Sectionssingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage10000 V
Plate Dissipation10000 W
Grid 1 Voltage-900 V
Cathode Current4000 mA
Audio Performance
Power Output20000 W
Key Features
- Vapor-cooled
- Coaxial grid lead-through
- Directly heated
- Thoriated tungsten cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF amplifier and modulator, class B operation (25 kW carrier) | 7500 V | 22000 | 727 | 16 | 2200 mA |
| AF amplifier and modulator, class B operation (20 kW carrier) | 6000 V | 22000 | 727 | 16 | 2200 mA |
Application Notes
Particularly suitable for modulators of 10 kW to 25 kW transmitters. Mount axis vertical, anode down.
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