275A
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BrandWestern Electric
ClassTriode
BaseStandard four-contact type
Construction
Primary TypeFilamentary Triode
EnvelopeGlass
Base MaterialMedium, four-pin, thrust type with bayonet pin
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation17 W
Cathode Current80 mA
Audio Performance
Power Output3.3 W
Key Features
- Moderate-power
- Filamentary triode
- Designed for 300V maximum plate voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Audio-frequency amplifier | 250V | 2780 | 1000 | 2.8 | 53mA |
| Maximum operating condition | 250V | 3220 | 870 | 2.8 | 68mA |
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.
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