4ES8
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BrandSylvania
ClassVHF Duo Triode
Filament4V @ 600mA
Construction
Primary TypeDouble Triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesDesigned for series heater string applications
Absolute Maximum Ratings
Plate Voltage130 V
Plate Dissipation1.8 W
Grid 1 Voltage-50 V
Cathode Current22 mA
H-C Voltage50 V
Audio Performance
Key Features
- Extremely high gm
- Low capacitances
- Low noise
- Semi-remote cutoff
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 90V | 12500 | - | - | 15mA |
| Cascode Operation | 180V | 12500 | - | - | 15mA |
Application Notes
Designed for use as cascode VHF amplifiers in TV tuners.
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