300A
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BrandWestern Electric
ClassModerate power, filamentary triode
BaseStandard, four-contact type (e.g. Western Electric 143B)
Construction
Primary Typetriode
EnvelopeGlass
Sectionssingle
Filament / Heater
MaterialFilamentary
Absolute Maximum Ratings
Plate Voltage450 V
Plate Dissipation40 W
Grid 1 Voltage-130 V
Cathode Current100 mA
Audio Performance
Power Output17.8 W
Key Features
- Moderate power
- Filamentary triode
- Low plate voltages
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Conditions | 250V | - | - | - | 50mA |
| Recommended Operating Conditions | 350V | - | - | - | 60mA |
| Recommended Operating Conditions | 450V | - | - | - | 60mA |
| Maximum Operating Conditions | 450V | - | - | - | 80mA |
Application Notes
Audio-frequency amplifier in positions where power outputs of approximately 10 watts or less are required.
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