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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Recommended Operating Conditions250V---50mA
Recommended Operating Conditions350V---60mA
Recommended Operating Conditions450V---60mA
Maximum Operating Conditions450V---80mA

Application Notes

Audio-frequency amplifier in positions where power outputs of approximately 10 watts or less are required.

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