Tube-number record
8ET7
0 archive entries
8ET7 is a tube type in the TubeDatabase archive (class: DUO-DIODE PENTODE). Recorded specifications: brand TUNG-SOL, year 1962, construction Multi-section, base Small Button 9 Pin, socket Noval (B9A), maximum plate voltage 430 V, and maximum plate dissipation 5 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassDUO-DIODE PENTODE
BaseNoval (B9A)
Filament8 V @ 600 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall Button 9 Pin
Sections3
Filament / Heater
Warm-up Time11s
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage430 V
Plate Dissipation5 W
Grid 2 Voltage430 V
H-C Voltage200 V
Audio Performance
Key Features
- Sharp-cutoff pentode
- Video amplifier
- Horizontal phase detector
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Class A1 Amplifier | 200 V | 11500 | 60000 | — | 25 mA |
Application Notes
The 8ET7 is a duo-diode sharp-cutoff pentode designed for use as a combined video amplifier and horizontal phase detector in television receivers.
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