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Tube-number record
ECC808
9 archive entries
BrandTelefunken
ClassAF-Twin Triode
BaseNoval (B9A)
Filament6.3 V @ 340 mA
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 | 250 V | 1600 | — | 100 | — |
| AF-Amplifier Entry 1 | 250 V | — | 220000 | — | 0.66 mA |
| AF-Amplifier Entry 2 | 250 V | — | 220000 | — | 0.56 mA |
| AF-Amplifier Tape Recorder Record Head | 250 V | — | 220000 | — | 0.49 mA |
Application Notes
Equivalent hum voltage less than 10 µV; equivalent noise voltage approx 2 µV (45 Hz - 15 kHz).
Datasheets
Datasheet: ECC808.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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