8425
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BrandWestinghouse
ClassPentode
Base7-pin miniature
Filament6.3V @ 300mA
Construction
Primary TypeSharp-Cutoff Pentode
EnvelopeT5-1/2
Sections1
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
- Wide band IF and RF amplifiers
- Interface-free long life
- High transconductance-to-plate-current ratio
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection - Class A Amplifier (1) | 100V | 4500 | 160000 | - | 4.8mA |
| Pentode Connection - Class A Amplifier (2) | 200V | 5500 | 630000 | - | 7.4mA |
| Pentode Connection - Class A Amplifier (3) | 250V | 6200 | 1100000 | - | 10.5mA |
| Triode Connected - Class A Amplifier | 250V | 6000 | - | 41 | 14mA |
Application Notes
Operationally similar to type 6AU6 but with higher transconductance-to-plate-current ratio.
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