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

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Tube-number record

ML-8464

0 archive entries

BrandMachlett
ClassShielded-grid triode
BaseSpecial / none
Filament5.5 V @ 20 mA

Construction

Primary TypeTriode
EnvelopeMetal-ceramic
Base MaterialLiquid-cooled anode
Sections1

Filament / Heater

MaterialOxide-coated
Warm-up Time10s
Heater NotesHeater starting current maximum 80 A

Absolute Maximum Ratings

Plate Voltage25000 V
Plate Dissipation1500 W
Grid 1 Voltage-600 V
Cathode Current25000 mA

Audio Performance

Key Features
  • Ruggedized
  • Shielded Grid
  • Unipotential oxide-coated cathode
  • Liquid-cooled anode
  • Flat plate-current curves

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pulse Modulator Condition 123000 V——20020000 mA
Pulse Modulator Condition 222500 V——20010000 mA

Application Notes

Designed as a switch tube in hard-tube pulse modulators for radar. Shielded grid protects cathode and control grid from transient arcs.

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