Tube-number record
221
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221 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand Western Electric, construction Triode, socket 4-pin, maximum plate voltage 150 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassPower Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeST-14
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2.5 W
Audio Performance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 130 V | 1600 | 2100 | 3.3 | 15 mA |
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