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

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BR 129 vacuum tube outline illustration

Tube-number record

BR 129

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BR 129 is a tube type in the TubeDatabase archive (class: Transmitting Triode). Recorded specifications: brand Marconi, construction Triode, maximum plate voltage 8500 V, and maximum plate dissipation 5000 W. The archive does not yet hold a photographed example of this type.

BrandMarconi
ClassTransmitting Triode

Construction

Primary TypeTriode
EnvelopeForced-air-cooled
SectionsSingle

Filament / Heater

MaterialTungsten

Absolute Maximum Ratings

Plate Voltage8500 V
Plate Dissipation5000 W

Audio Performance

Key Features
  • Forced-air cooled
  • Tungsten filament

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
HF Amplifier and Oscillator5000 V11000—211000 mA

Application Notes

All air cooling supplies must be in operation before the application of any supply voltage and should be continued for at least one minute after the removal of all supply voltages. Filament current must not exceed 187A during switching on.

Datasheets

Datasheet: BR129.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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