205E
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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
- Low sputter noise design
- Special contact metal pins
- Low microphonic noise
- Suitable for audio amplifier, modulator, or oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Point 1) | 200V | 1840 | 4000 | 7.4 | 22.5mA |
| Class A Amplifier (Point 2) | 250V | 1160 | 6000 | 6.9 | 9mA |
| Class A Amplifier (Point 3) | 350V | 1940 | 3800 | 7.3 | 29mA |
| Class A Amplifier (Maximum Operating Conditions) | 400V | 1890 | 3800 | 7.2 | 30mA |
Application Notes
The 205E is similar to the 205D but with special precautions to minimize sputter and contact noise. Mounting can be vertical or horizontal; if horizontal, the filament plane should be vertical.
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