271A
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BrandWestern Electric
ClassModerate-power triode
BaseStandard, five-contact type (e.g., Western Electric 141A)
Filament5V @ 2000mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesDesigned to operate on a voltage basis; AC or DC.
Absolute Maximum Ratings
Plate Voltage450 V
Grid 1 Voltage20 V
Cathode Current60 mA
H-C Voltage90 V
Audio Performance
Power Output3.4 W
Key Features
- Indirectly heated cathode
- Low hum level (30dB lower than filamentary tubes)
- Moderate-power triode
- Flexible mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 300V | 2250 | 3650 | 8.2 | 19.5mA |
| Typical Operation | 350V | 2300 | 3550 | 8.1 | 21.5mA |
| Typical Operation | 400V | 2350 | 3450 | 8.1 | 24.5mA |
| Maximum Operating Conditions | 450V | 3480 | 2450 | 8.5 | 57.5mA |
Application Notes
Applications include audio-frequency amplifier or modulator, radio-frequency power amplifier, and oscillator. Cathode can be connected to heater terminal 5 or a transformer center tap for minimum hum.
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