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8T39

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BrandNEC
ClassTriode
BaseCustom (Ring-sealed grid terminal)

Construction

Primary TypeTriode
EnvelopeGlass/Metal (Vapour Cooled Anode)
SectionsSingle

Filament / Heater

MaterialThoriated Tungsten
Warm-up Time1s

Absolute Maximum Ratings

Plate Voltage10000 V
Plate Dissipation10000 W
Grid 1 Voltage-1000 V
Cathode Current2700 mA

Audio Performance

Power Output22000 W
Key Features
  • Vapour Cooled
  • Thoriated tungsten filament
  • High transconductance
  • Ring-sealed grid terminal
  • Low lead inductance

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Power Amplifier and Oscillator-Class C Telegraphy9000V18000-402500mA
AF Power Amplifier and Modulator-Class B8000V18000-404000mA

Application Notes

Designed for use as an amplifier, modulator or oscillator in AM broadcast transmitters and industrial heating services. Maximum ratings apply up to 30 Mc/s.

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