Tube-number record
2L33
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2L33 is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: brand TESLA, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 150 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
BrandTESLA
ClassPower Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Materialoxide
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2 W
Grid 2 Voltage135 V
Grid 1 Voltage-30 V
Cathode Current25 mA
Audio Performance
Key Features
- Directly heated cathode
- Miniature 7-pin base
- Center-tapped filament
- Parallel or series filament operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Set 1) | 135 V | — | — | — | 14.8 mA |
| Class A Amplifier (Set 2) | 150 V | — | — | — | 13.3 mA |
Application Notes
The TESLA 2L33 is a directly heated pentode suitable for use as a Class A power output tube or a Class C high-frequency power amplifier. The suppressor grid is connected to the filament center tap, which is brought out to a separate pin, allowing for both parallel and series filament operation.
Datasheets
Datasheet: 2L33.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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