Tube-number record
8425-A
0 archive entries
8425-A is a tube type in the TubeDatabase archive (class: Sharp-cutoff Pentode). Recorded specifications: brand General Electric, construction Pentode, base Glass, socket Miniature 7-pin (B7G), maximum plate voltage 310 V, and maximum plate dissipation 3.2 W. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassSharp-cutoff Pentode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeT-5 1/2, Glass
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
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
The equipment designer should design the equipment so that heater voltage is centered at the specified bogey value.
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