4211-D
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BrandStandard Telephones and Cables
ClassTriode
BaseLarge 4-pin bayonet
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation65 W
Cathode Current200 mA
Audio Performance
Typical THD4.5%
Power Output8.1 W
Key Features
- Oxide coated filament
- Constant voltage type
- Replacement for 4211-E
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Amp | 900V | 4000 | 3000 | 12 | 55mA |
| Class B Telephony | 1000V | - | - | - | 75mA |
| Class C Telephony | 750V | - | - | - | 100mA |
| Class C Telegraphy | 1000V | - | - | - | 135mA |
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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