8426
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BrandWestinghouse
ClassReceiving Tube
BaseMiniature 7-pin
Filament12.6V @ 150mA
Construction
Primary TypePentode
EnvelopeT-5 1/2
Base MaterialGlass
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3.5 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Sharp-cutoff pentode
- Wide band IF and RF amplifier
- High transconductance-to-plate-current ratio
- Interface-free long life cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Class A - Op 1 | 100V | 4500 | 600000 | - | 5.5mA |
| Pentode Class A - Op 2 | 250V | 5500 | 1300000 | - | 7.6mA |
| Pentode Class A - Op 3 | 250V | 6200 | 1100000 | - | 10.5mA |
| Triode Connected | 250V | 5000 | - | 41 | 14.2mA |
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