Tube-number record
EF74
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ClassPentode
BaseB8D / B8F
Filament6.3 V @ 200 mA
Construction
Primary TypePentode
EnvelopeSubminiature
SectionsSingle
Filament / Heater
Heater NotesTo reduce the possibility of hum the heater should be operated from d.c.
Absolute Maximum Ratings
Plate Voltage175 V
Plate Dissipation0.9 W
Grid 2 Voltage175 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Key Features
- Low microphony
- Subminiature
- Long life
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 100 V | 3400 | 200000 | 28 | 7 mA |
Application Notes
Direct soldered connection leads must be at least 5mm from the seal. Cooling: In operation this valve must be cooled. Recommended method is to mount the valve in a metal clip which will conduct the heat away to the chassis.
Datasheets
Datasheet: EF74.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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