2L33
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BrandTESLA
ClassPower Pentode
BaseMiniature 7-pin
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) | 135V | - | - | - | 14.8mA |
| Class A Amplifier (Set 2) | 150V | - | - | - | 13.3mA |
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.
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