205D
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BrandWestern Electric
ClassModerate power, filamentary triode
BaseMedium, four-pin, bayonet type
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide-coated
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation14 W
Cathode Current50 mA
Audio Performance
Power Output1.4 W
Key Features
- Moderate power output
- Filamentary triode
- Low microphonic noise
- Audio-frequency amplifier
- Radio-frequency power amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 200V | 1840 | 4000 | 7.4 | 22.5mA |
| Class A | 250V | 1160 | 6000 | 6.9 | 9mA |
| Class A | 300V | 1830 | 4000 | 7.3 | 25mA |
| Class A Maximum | 400V | 1890 | 3800 | 7.2 | 30mA |
Application Notes
The filament is designed to operate on a voltage basis. When using AC supply, grid and plate returns should connect to a center tap. For frequencies above 15 MHz, ratings should be reduced.
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