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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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7581 vacuum tube outline illustration

Tube-number record

7581

0 archive entries

7581 is a tube type in the TubeDatabase archive (class: Beam Power Pentode). Recorded specifications: brand TUNG-SOL, year 1962, construction Beam tetrode / beam power, base Low-loss material, socket Octal, maximum plate voltage 500 V, and maximum plate dissipation 20 W. The archive does not yet hold a photographed example of this type.

BrandTUNG-SOL
ClassBeam Power Pentode
BaseOctal
Filament6.3 V @ 900 mA

Construction

Primary TypeBeam tetrode / beam power
EnvelopeGlass T-12
Base MaterialLow-loss material

Filament / Heater

Heater NotesCoated Unipotential Cathode

Absolute Maximum Ratings

Plate Voltage500 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Connection250 V600022500—72 mA
Class A1 Amplifier - Triode Connection250 V47001700840 mA
Class A1 Amplifier - Pentode Connection300 V530035000—

Application Notes

The 7581 is a beam-power pentode primarily designed for use in audio-frequency power-amplifier applications. It features additional controlled zero-bias characteristics and a low-loss base.

Datasheets

Datasheet: 7581.pdf

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

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Manufacturers

Brands

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    Plate Dissipation20 W
    Grid 2 Voltage450 V
    H-C Voltage200 V

    Audio Performance

    Typical THD5%
    Power Output1.4 W
    Key Features
    • Direct replacement for 6L6GC
    • Controlled zero-bias characteristics
    • Low-loss base
    48 mA
    Class A1 Amplifier - Pentode Connection350 V520034000—54 mA