1L33
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BrandTesla
ClassOutput Pentode
BaseMiniature 7-pin
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide-coated
Absolute Maximum Ratings
Plate Voltage90 V
Plate Dissipation0.7 W
Grid 2 Voltage67.5 V
Cathode Current12 mA
Audio Performance
Typical THD12%
Power Output0.23 W
Key Features
- Directly heated
- Miniature 7-pin base
- Suitable for Class A or Class C RF
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier | 90V | 1400 | 100000 | 140 | 7.5mA |
| Class A Audio Amplifier Low Voltage | 45V | 1250 | 100000 | - | 3.8mA |
Application Notes
Commonly used in battery-powered portable receivers as a power output tube.
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