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EC81

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BrandPhilips
ClassUHF Oscillator Triode
BaseNoval
Filament6.3V @ 0.24mA

Construction

Primary TypeTriode
EnvelopeGlass
Base MaterialGlass
Sections1

Filament / Heater

Heater NotesIndirectly heated by A.C. or D.C.; parallel supply. Requires 3 Ohm series resistor or stabilized supply.

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation5 W
Grid 1 Voltage-100 V
Cathode Current30 mA
H-C Voltage100 V

Audio Performance

Key Features
  • UHF Oscillator
  • Low Interelectrode Capacitances
  • High Transconductance

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical characteristics 1120V400040001620mA
Typical characteristics 2150V550029091630mA

Application Notes

The tube should only be used with a resistor of 3 Ohms in series with the heater or with stabilized heater voltage to ensure longevity. Operating characteristics provided for UHF oscillator performance at wavelengths of 40cm and 80cm.

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