EF 8010
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BrandTelefunken
ClassRemote cutoff RF-pentode
BaseNoval
Filament6.3V @ 300mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated, DC-AC heating
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-50 V
Cathode Current20 mA
H-C Voltage150 V
Audio Performance
Key Features
- Long life
- Tight tolerances
- Vibration and shock proof
- Cathode free from interface
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Measuring Condition | 200V | 12500 | 500000 | - | 12mA |
| Typical Operation (170V) | 170V | 14000 | - | - | 14mA |
| Typical Operation (200V) | 200V | 12500 | - | - | 10.5mA |
| Typical Operation (230V) | 230V | 500 | - | - | 2.4mA |
Application Notes
The cathode establishes no interface even when heated without plate current for long periods. Operation with cathode and/or screen grid resistor is recommended.
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