EF 8
0 Tubes in archive
ClassLow-noise RF Pentode / Selectode
BaseSide-contact
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Key Features
- Low noise
- Variable transconductance (Selektode)
- Beam-forming grid for reduced screen current
- Optimized for shortwave performance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier | 250V | - | 450000 | - | 8mA |
Application Notes
Specifically designed as an input stage for receivers to minimize noise. Features an additional grid between the control grid and screen grid to align electron paths.
Datasheet Viewer
Loading datasheet...
Sort by
Showing 1 to 0 of 0 results