Tube-number record
8CG7
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BrandTung-Sol
ClassDouble Triode
BaseNoval (B9A)
Filament8.4 V @ 450 mA
Construction
Primary TypeDual triode
EnvelopeGlass Bulb
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesAC OR DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3.5 W
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Medium-mu twin triode
- 9-pin miniature construction
- Heater warmup time controlled for series string operation
- Coated unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 90 V | 3000 | 6700 | 20 | 10 mA |
| Class A1 Amplifier | 250 V | 2600 | 7700 | 20 | 9 mA |
Application Notes
Intended particularly for use as a vertical deflection oscillator and horizontal deflection oscillator in television receivers. It may also be used as a phase inverter, multivibrator, synchronizing separator and amplifier, and resistance coupled amplifier.
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