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

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

ML-8549

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BrandMachlett
ClassSuper Power Triode
BaseCoaxial

Construction

Primary Type
Triode
EnvelopeCeramic-metal
Base MaterialCoaxial water-cooled
SectionsSingle

Filament / Heater

MaterialThoriated-tungsten

Absolute Maximum Ratings

Plate Voltage65000 V
Plate Dissipation500000 W
Grid 1 Voltage-5000 V
Cathode Current1200000 mA

Audio Performance

Key Features
  • Water-cooled anode
  • Self-supporting thoriated-tungsten filaments
  • Low inductance coaxial terminals
  • Ion pump included

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class C Telephony (Cathode Drive)15000 V——2090000 mA
Class C Telegraphy25000 V——20115000 mA

Application Notes

When used as a switch tube in hard-tube pulse modulators, it can deliver more than 60 Mw pulse output. Adequate rayproof shielding for x-rays must be provided.

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