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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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33 vacuum tube outline illustration

Tube-number record

33

0 archive entries

33 is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: brand Sylvania, construction Pentode, socket 4-pin, and maximum plate voltage 180 V. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassPower Pentode
Base4-pin

Construction

Primary TypePentode
EnvelopeST-12
SectionsSingle

Filament / Heater

MaterialThoriated Tungsten

Absolute Maximum Ratings

Plate Voltage180 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Pentode180 V1450500007014.5 mA

Datasheets

Datasheet: 33.pdf

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

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    Grid 2 Voltage180 V

    Audio Performance

    Typical THD7%
    Power Output1.4 W
    Key Features
    • Directly heated filament
    • Power amplifier pentode