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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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70L7-GT vacuum tube outline illustration

Tube-number record

70L7-GT

0 archive entries

70L7-GT is a tube type in the TubeDatabase archive (class: Rectifier-Beam Power Amplifier). Recorded specifications: brand General Electric, construction Display / CRT, base Phenolic, socket Octal, maximum plate voltage 150 V, and maximum plate dissipation 5.6 W. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric
ClassRectifier-Beam Power Amplifier
BaseOctal
Filament70 V @ 0.15 mA

Construction

Primary TypeDisplay / CRT
EnvelopeT-9
Base MaterialPhenolic
SectionsDouble (Rectifier + Beam Power Amplifier)

Filament / Heater

Heater NotesA-C or D-C operation

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier110 V750015000—40 mA

Application Notes

The 70L7-GT is intended for use as the power rectifier and power amplifier tube in circuits requiring series heater operation.

Filters

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Manufacturers

Brands

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    Plate Voltage150 V
    Plate Dissipation5.6 W
    Grid 2 Voltage150 V
    H-C Voltage175 V

    Audio Performance

    Typical THD10%
    Power Output1.8 W
    Key Features
    • Half-wave rectifier
    • Beam power amplifier
    • Series heater operation
    • Unipotential cathode