Tube-number record
8426-A
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BrandGeneral Electric
ClassPentode
BaseMiniature 7-pin (B7G)
Filament12.6 V @ 150 mA
Construction
Primary TypePentode
EnvelopeT-5 1/2
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Grid 2 Voltage155 V
H-C Voltage200 V
Audio Performance
Key Features
- Miniature sharp-cutoff pentode
- Industrial applications
- Unilaterally interchangeable with 8426
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 100 V | 4500 | 600000 | — | 4.8 mA |
| Pentode Connection | 250 V | 5500 | 1300000 | — | 7.4 mA |
| Pentode Connection | 250 V | 6200 | 1100000 | — | 10.5 mA |
Application Notes
Heater voltage variations should be restricted to maintain bogey value. Designed for industrial applications.
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