3S4
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BrandSylvania
ClassPower Amplifier Pentode
Base7-Pin Miniature
Construction
Primary TypePentode
EnvelopeT-5 1/2
Base MaterialMiniature Button
SectionsSingle
Filament / Heater
MaterialCoated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current12 mA
Audio Performance
Typical THD10%
Power Output0.27 W
Key Features
- Miniature power amplifier pentode
- Portable, battery operated equipment
- Series or Parallel filament operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Series Filament) | 67.5V | 1400 | 100000 | - | 6mA |
| Class A Amplifier (Series Filament) | 90V | 1425 | 100000 | - | 6.1mA |
| Class A Amplifier (Parallel Filament) | 67.5V | 1550 | 100000 | - | 7.2mA |
| Class A Amplifier (Parallel Filament) | 90V | 1575 | 100000 | - | 7.4mA |
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