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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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1L33 vacuum tube outline illustration

Tube-number record

1L33

0 archive entries

1L33 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Tesla, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 90 V, and maximum plate dissipation 0.7 W. The archive does not yet hold a photographed example of this type.

BrandTesla
ClassOutput Pentode
BaseMiniature 7-pin (B7G)

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialOxide-coated

Absolute Maximum Ratings

Plate Voltage90 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Audio Amplifier90 V14001000001407.5 mA
Class A Audio Amplifier Low Voltage45 V1250100000—3.8 mA

Application Notes

Commonly used in battery-powered portable receivers as a power output tube.

Datasheets

Datasheet: 1L33.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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    Plate Dissipation
    0.7 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