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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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6L6 vacuum tube outline illustration

Tube-number record

6L6

0 archive entries

6L6 is a tube type in the TubeDatabase archive (class: Beam Power Pentode). Recorded specifications: brand Sylvania, construction Beam tetrode / beam power, socket Octal, maximum plate voltage 360 V, and maximum plate dissipation 18.5 W. The archive does not yet hold a photographed example of this type.

Equivalent and related tube numbers

Commonly cross-referenced designations for 6L6. Compatibility is not guaranteed. Before substituting, verify socket and pinout, heater voltage and current, bias requirements, and maximum ratings against the relevant manufacturers’ datasheets.

  • 5881
  • EL37
  • KT66
BrandSylvania
ClassBeam Power Pentode
BaseOctal
Filament6.3 V @ 900 mA

Construction

Primary TypeBeam tetrode / beam power
Envelope10A-2
Sections

Datasheets

Datasheet: 6L6.pdf

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

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    Single

    Filament / Heater

    Absolute Maximum Ratings

    Plate Voltage360 V
    Plate Dissipation18.5 W
    Grid 2 Voltage270 V

    Audio Performance

    Key Features
    • High sensitivity
    • High power output
    • Beam power structure
    • Suppressed secondary emission

    Typical Operation

    ModePlate VGm (µmhos)Rp (Ω)µPlate mA
    Pentode Class A1250 V600022500—72 mA
    Pentode Class A1300 V530035000—48 mA
    Pentode Class A1350 V520033000—54 mA
    Triode Class A1250 V47001700840 mA

    Application Notes

    Recommended for power output stages in radio receivers. Max heater voltage should not exceed 7.0V. Grid circuit resistance limits: 100,000 Ohms for fixed bias, 250,000 Ohms for auto-bias.