EF 804S
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BrandAEG
ClassPentode
BaseNoval (Pico 9)
Filament6.3V @ 170mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly DC or AC heated
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 2 Voltage200 V
Cathode Current6 mA
H-C Voltage100 V
Audio Performance
Typical THD0.6%
Key Features
- Low microphony
- Low hum
- Reliability
- Long Life
- Exacting Tolerances
- Vibration Proofed
- Shock Proofed
- Special Cathode Free from Interface
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Measured Values | 250V | 2000 | 2000000 | 38 | 3.2mA |
| AF Resistance-Coupled Amplifier (Pentode) | 250V | - | - | 210 | 0.61mA |
| AF Resistance-Coupled Amplifier (Triode) | 250V | - | - | 31 | 0.85mA |
Application Notes
Specifically designed for low-noise audio frequency amplification.
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