Tube-number record
4021-A
0 archive entries
4021-A is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Standard Valves, construction Triode, and socket 4-pin. The archive does not yet hold a photographed example of this type.
BrandStandard Valves
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Filament / Heater
MaterialOxide coated filament
Absolute Maximum Ratings
Audio Performance
Key Features
- Oxide coated filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 130 V | 3000 | 2050 | 6 | 22.5 mA |
| Class A | 130 V | — | 1750 | — | 28.4 mA |
| Class A | 130 V | — | 2100 | — | 17 mA |
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