Tube-number record
EF85
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BrandPhilips
ClassR.F. Pentode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated, AC or DC, parallel or series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable mutual conductance
- Wide-band amplifier use
- High transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. or I.F. amplifier | 250 V | 6000 | 600000 | 26 | 10 mA |
| R.F. or I.F. amplifier (resistor feed 18k) | 250 V | 6000 | 600000 | — | 10 mA |
| R.F. or I.F. amplifier (resistor feed 22k) | 250 V | 6000 | 600000 | — | 10 mA |
Datasheets
Datasheet: EF85.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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