8CN7
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BrandTung-Sol
ClassDuplex-Diode High-Mu Triode
Base9-pin Miniature
Filament8.4V @ 225mA
Construction
Primary TypeDuplex-Diode Triode
EnvelopeGlass
Base MaterialSmall Button (9EN)
Sections3
Filament / Heater
Warm-up Time11s
Heater NotesSeries or Parallel connection; Heater warm-up time applies to parallel connection only.
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation1 W
Cathode Current5 mA
H-C Voltage200 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- Controlled heater warm-up time
- Separate cathodes for diode and triode sections
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 1300 | 54000 | 70 | 0.8mA |
| Class A1 Amplifier | 250V | 1200 | 58000 | 70 | 1mA |
Application Notes
Intended for service as a combined horizontal phase detector and reactance tube in television receivers.
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