3E5
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BrandSylvania Electric
ClassBeam Pentode
BaseMiniature Button 7-Pin
Construction
Primary TypeBeam Pentode
EnvelopeT-5 1/2
Sections1
Filament / Heater
Materialcoated filament
Absolute Maximum Ratings
Plate Voltage110 V
Grid 2 Voltage110 V
Cathode Current8 mA
Audio Performance
Typical THD9.5%
Power Output0.2 W
Key Features
- Miniature
- Coated filament
- Series or parallel filament operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Parallel Filaments, 67.5V | 67.5V | 1300 | 120000 | - | 5mA |
| Parallel Filaments, 90V | 90V | 1200 | 140000 | - | 6mA |
| Series Filaments, 67.5V | 67.5V | 1200 | 110000 | - | 4.5mA |
| Series Filaments, 90V | 90V | 1100 | 120000 | - | 5.5mA |
Application Notes
For power-line operation the filament voltage is centered at 1.4 or 2.8 volts respectively. Shunting resistor across negative section of filament is necessary in series operation to limit current.
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