Tube-number record
275A
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275A is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Western Electric, construction Triode, base Medium, four-pin, thrust type with bayonet pin, socket 4-pin, maximum plate voltage 300 V, and maximum plate dissipation 17 W. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMedium, four-pin, thrust type with bayonet pin
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Audio-frequency amplifier | 250 V | 2780 | 1000 | 2.8 | 53 mA |
| Maximum operating condition | 250 V | 3220 | 870 | 2.8 | 68 mA |
Application Notes
Audio-frequency amplifier where power outputs of about 3 watts per tube are required. If mounted in a horizontal position, the plane of the filament should be vertical.
Datasheets
Datasheet: 275A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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