Tube-number record
8425
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BrandWestinghouse
ClassPentode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
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) | 100 V | 4500 | 160000 | — | 4.8 mA |
| Pentode Connection - Class A Amplifier (2) | 200 V | 5500 | 630000 | — | 7.4 mA |
| Pentode Connection - Class A Amplifier (3) | 250 V | 6200 | 1100000 | — |
Application Notes
Operationally similar to type 6AU6 but with higher transconductance-to-plate-current ratio.
Datasheets
Datasheet: 8425.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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