Tube-number record
ECH 8000
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BrandTELEFUNKEN
ClassRemote cutoff heptode with triode
BaseNoval (B9A)
Filament6.3 V @ 320 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
SectionsHeptode, Triode
Filament / Heater
Heater NotesIndirectly heated, parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.1 W
Grid 2 Voltage300 V
Cathode Current20 mA
H-C Voltage100 V
Audio Performance
Key Features
- Reliability Factor P: 1.5/1000h
- Long life: 10,000 hours guaranteed
- Vibration and shock proof (2.5g continuous, 500g momentary)
- Cathode free from interface layer
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode as RF/IF amplifier | 250 V | 5000 | 600000 | 20 | 8 mA |
| Triode section (Measuring values) | 100 V | 4200 | — | 18 | 11 mA |
| Heptode as mixer | 250 V | 1500 | 700000 | — | 4 mA |
Datasheets
Datasheet: ECH8000.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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