Tube-number record
RS 558
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BrandTelefunken
ClassWater-cooled Transmission Triode
Construction
Primary TypeTriode
EnvelopeMetal-Glass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation40000 W
Audio Performance
Key Features
- Water cooled
- Directly heated
- Suitable for plate modulation
- Thoriated tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier | 10000 V | 40000 | — | 110 | 1750 mA |
Application Notes
Designed for communications technology and industrial generators. Cooling requires 1 l/min per kW of plate dissipation with a minimum flow of 5 l/min.
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