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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical characteristics 1 | 120V | 4000 | 4000 | 16 | 20mA |
| Typical characteristics 2 | 150V | 5500 | 2909 | 16 | 30mA |
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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