ECC808
9 Tubes in archive
BrandTelefunken
ClassAF-Twin Triode
BaseNoval
Filament6.3V @ 340mA
Construction
Primary TypeTriode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirectly heated, DC-AC-Heating
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation0.5 W
Grid 1 Voltage-1.3 V
Cathode Current4 mA
H-C Voltage100 V
Audio Performance
Typical THD2.5%
Power Output0.05 W
Key Features
- Low microphonics
- Low hum
- Low noise
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Measuring values per System | 250V | 1600 | - | 100 | - |
| AF-Amplifier Entry 1 | 250V | - | 220000 | - | 0.66mA |
| AF-Amplifier Entry 2 | 250V | - | 220000 | - | 0.56mA |
| AF-Amplifier Tape Recorder Record Head | 250V | - | 220000 | - | 0.49mA |
Application Notes
Equivalent hum voltage less than 10 µV; equivalent noise voltage approx 2 µV (45 Hz - 15 kHz).
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