Tube-number record
3A/105-B
0 archive entries
3A/105-B is a tube type in the TubeDatabase archive (class: Low Noise Triode). Recorded specifications: brand Standard Valves, construction Triode, socket 4-pin, maximum plate voltage 250 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandStandard Valves
ClassLow Noise Triode
Base4-pin
Filament13 V @ 0.19 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide coated
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation (Constants) | 130 V | 2100 | 19000 | 40 | — |
| Typical Operation A | 150 V | — | — | — | — |
| Typical Operation B | 200 V | — | — | — | — |
Application Notes
Low noise triode for audio applications. Constant voltage type cathode.
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