Tube-number record
228A
0 archive entries
228A is a tube type in the TubeDatabase archive (class: Filamentary water-cooled triode). Recorded specifications: brand Western Electric, construction Triode, socket Special / none, maximum plate voltage 6000 V, and maximum plate dissipation 5000 W. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassFilamentary water-cooled triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeWater-cooled
Sections1
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage6000 V
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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