4GX7
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BrandWestinghouse
ClassTriode & Frame-grid Pentode Converter
BaseMiniature 9-Pin
Filament4.2V @ 0.6mA
Construction
Primary TypeTriode-Pentode
EnvelopeT-6 1/2
Base MaterialGlass
SectionsTriode, Pentode
Filament / Heater
Heater NotesControlled heater warm-up time
Absolute Maximum Ratings
Plate Voltage275 V
Plate Dissipation2.2 W
Grid 2 Voltage275 V
Grid 1 Voltage-40 V
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Frame-grid pentode
- Sharp-cutoff
- Low grid-to-plate capacitance
- Controlled heater warm-up time
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Unit | 125V | 8500 | 4700 | 40 | 13mA |
| Pentode Unit | 125V | 11000 | 200000 | - | 8mA |
Application Notes
Designed for oscillator-mixer service in V.H.F. television tuners.
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