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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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7L7 vacuum tube outline illustration

Tube-number record

7L7

0 archive entries

7L7 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand Tung-Sol, year 1949, construction Other / special, base Lock-in, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 4 W. The archive does not yet hold a photographed example of this type.

BrandTung-Sol
ClassPentode
BaseLoctal
Filament6.3 V @ 300 mA

Construction

Primary TypeOther / special
EnvelopeGlass
Base MaterialLock-in
SectionsSingle

Filament / Heater

Heater NotesAC or DC

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier (100V)100 V3000100000—5.5 mA
Class A1 Amplifier (250V)250 V31001000000—4.5 mA

Application Notes

Useful as an IF amplifier or limiter in FM equipments.

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Plate Voltage300 V
    Plate Dissipation4 W
    Grid 2 Voltage125 V
    H-C Voltage90 V

    Audio Performance

    Key Features
    • Sharp cut-off
    • High transconductance
    • Lock-in construction
    • Triple grid