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V.503

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BrandMazda
ClassTriode
Base4-pin

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialDirectly Heated

Absolute Maximum Ratings

Plate Voltage450 V
Plate Dissipation25 W

Audio Performance

Typical THD5%
Power Output40 W
Key Features
  • Directly heated
  • Power output triode
  • Class AB operation

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Static (Ea=100V, Eg=0)100V100004254.25-
Push-Pull Class AB (400V)400V4500--100mA
Push-Pull Class AB (450V)450V4500--110mA

Application Notes

The V.503 is intended for use in public address equipment. It should only be used with individual bias adjustment from a separate source to give the correct quiescent feed current. The grid-cathode resistance should not exceed 50,000 ohms. The valve is not intended for 'positive drive' conditions.

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