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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static (Ea=100V, Eg=0) | 100V | 10000 | 425 | 4.25 | - |
| Push-Pull Class AB (400V) | 400V | 4500 | - | - | 100mA |
| Push-Pull Class AB (450V) | 450V | 4500 | - | - | 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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