Tube-number record
3W4/3S4-SF
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BrandFederation of Japan Electric Communication Industrial Associations
ClassPower Amplifier Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeT-5 1/2
Base MaterialGlass
SectionsSingle
Filament / Heater
Materialcoated
Absolute Maximum Ratings
Plate Voltage99 V
Grid 2 Voltage90 V
Cathode Current11 mA
Audio Performance
Typical THD12%
Power Output0.25 W
Key Features
- Series/Parallel Filament Operation
- Directly Heated Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 85 V | 1700 | 150000 | — | 6.8 mA |
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