Tube-number record
EF70
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BrandMullard
ClassPentode
BaseB8D / B8F
Filament6.3 V @ 0.2 mA
Construction
Primary TypePentode
EnvelopeSubminiature
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage175 V
Plate Dissipation0.75 W
Grid 2 Voltage175 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Key Features
- Subminiature high slope r.f. pentode
- Short suppressor grid base
- Internal diode connected to suppressor grid
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 100 V | 2500 | 100000 | 38 | 3 mA |
Application Notes
A diode is connected internally to the suppressor grid to prevent this grid locking at a positive voltage. Direct soldered connections must be at least 5mm from the seal.
Datasheets
Datasheet: EF70.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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