Tube-number record
EC81
0 archive entries
EC81 is a tube type in the TubeDatabase archive (class: UHF Oscillator Triode). Recorded specifications: brand Philips, construction Triode, base Glass, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 5 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassUHF Oscillator Triode
BaseNoval (B9A)
Filament6.3 V @ 0.24 mA
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical characteristics 1 | 120 V | 4000 | 4000 | 16 | 20 mA |
| Typical characteristics 2 | 150 V | 5500 | 2909 | 16 | 30 mA |
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.
Datasheets
Datasheet: EC81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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