3A4
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BrandMAZDA BELVU
ClassPower Pentode
Base7-pin miniature
Construction
Primary TypePentode
EnvelopeA 19-2
Base MaterialGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage165 V
Plate Dissipation2.2 W
Grid 2 Voltage150 V
Cathode Current27 mA
Audio Performance
Typical THD5%
Power Output0.6 W
Key Features
- Series or parallel filament operation
- Low power pentode
- Oscillator or Amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A - Parallel Filament (1.4V) | 135V | 1900 | 100000 | - | 14.8mA |
| Class A - Parallel Filament (1.4V) | 150V | 1900 | 100000 | - | 13.3mA |
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