Tube-number record
3E5
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3E5 is a tube type in the TubeDatabase archive (class: Beam Pentode). Recorded specifications: brand Sylvania Electric, construction Beam tetrode / beam power, socket Miniature 7-pin (B7G), and maximum plate voltage 110 V. The archive does not yet hold a photographed example of this type.
BrandSylvania Electric
ClassBeam Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypeBeam tetrode / beam power
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 | 67.5 V | 1300 | 120000 | — | 5 mA |
| Parallel Filaments, 90V | 90 V | 1200 | 140000 | — | 6 mA |
| Series Filaments, 67.5V | 67.5 V | 1200 | 110000 | — | 4.5 mA |
| Series Filaments, 90V | 90 V | 1100 | 120000 | — | 5.5 mA |
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.
Datasheets
Datasheet: 3E5.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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