Tube-number record
4211-D
0 archive entries
4211-D is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Standard Telephones and Cables, construction Triode, socket 4-pin, maximum plate voltage 1000 V, and maximum plate dissipation 65 W. The archive does not yet hold a photographed example of this type.
BrandStandard Telephones and Cables
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Absolute Maximum Ratings
Plate Voltage1000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Amp | 900 V | 4000 | 3000 | 12 | 55 mA |
| Class B Telephony | 1000 V | — | — | — | 75 mA |
| Class C Telephony | 750 V | — | — | — | 100 mA |
Application Notes
The 4211-E valve is similar to 4211-D valve but has small chokes connected in series with the grid and anode leads to prevent spurious oscillations. This valve should be mounted so that the filament is operated in a vertical plane.
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