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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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RS 558 vacuum tube outline illustration

Tube-number record

RS 558

0 archive entries

RS 558 is a tube type in the TubeDatabase archive (class: Water-cooled Transmission Triode). Recorded specifications: brand Telefunken, construction Triode, maximum plate voltage 12000 V, and maximum plate dissipation 40000 W. The archive does not yet hold a photographed example of this type.

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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Amplifier10000 V40000—1101750 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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