Tube-number record
228A
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BrandWestern Electric
ClassFilamentary water-cooled triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeWater-cooled
Sections1
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage6000 V
Plate Dissipation5000 W
Cathode Current1500 mA
Audio Performance
Typical THD5%
Power Output285 W
Key Features
- Water-cooled anode
- Tungsten filament
- May be used as audio amplifier or RF oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 5000 V | 6500 | 2500 | 16 | 900 mA |
| Class A Audio Amplifier (1) | 5000 V | — | 5000 | — | 850 mA |
| Class A Audio Amplifier (2) | 6000 V | — | 7500 | — | 800 mA |
Application Notes
The tube should be mounted only in a vertical position with the anode end down. Distilled water is recommended for the cooling system. Provision should be made to safeguard against applying filament and plate voltages before cooling water is circulating.
Datasheets
Datasheet: 228A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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