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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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Tube-number record

70A7GT

0 archive entries

70A7GT is a tube type in the TubeDatabase archive (class: Beam Power Amplifier / Half-Wave Rectifier). Recorded specifications: brand TUNG-SOL, year 1940, construction Rectifier, base Intermediate 8 Pin Octal, socket Octal, and maximum plate voltage 110 V. The archive does not yet hold a photographed example of this type.

BrandTUNG-SOL
ClassBeam Power Amplifier / Half-Wave Rectifier
BaseOctal
Filament70 V @ 150 mA

Construction

Primary TypeRectifier
EnvelopeT-9
Base MaterialIntermediate 8 Pin Octal
Sections2

Filament / Heater

Heater NotesTapped heater for pilot lamp connection between pins 6 and 7.

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier110 V5800—8040 mA

Application Notes

Used with a 0.15 ampere pilot lamp connected between pins 6 and 7. Rectifier DC output flows through the pilot lamp section; the tube should not be used without a pilot lamp.

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Manufacturers

Brands

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    Plate Voltage110 V
    Grid 2 Voltage110 V

    Audio Performance

    Typical THD6.5%
    Power Output1.5 W
    Key Features
    • Combined Beam Power Amplifier and Half-Wave Rectifier
    • Tapped Heater for Pilot Lamp