4R-HH2
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ClassMedium-mu Twin Triode
BaseE9-1 Small Button Noval 9-Pin
Filament4.2V @ 600mA
Construction
Primary TypeTwin Triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesTransformer-less television receivers
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2 W
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Cascade connected RF amplifier
- High sensitivity
- Low noise
- Designed for VHF tuners
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier | 90V | 8000 | - | 36 | 8.5mA |
Application Notes
Specifically designed for use as a cascade connected RF amplifier in the VHF tuner of transformer-less television receivers.
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