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Tube Database (7,341 tube types · 1,270 archive entries)

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6788 vacuum tube outline illustration

Tube-number record

6788

0 archive entries

6788 is a tube type in the TubeDatabase archive (class: Premium Subminiature Sharp-Cutoff Pentode). Recorded specifications: brand Sylvania, construction Pentode, base Glass, socket Subminiature, maximum plate voltage 250 V, and maximum plate dissipation 0.5 W. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassPremium Subminiature Sharp-Cutoff Pentode
BaseSubminiature
Filament6.3 V @ 175 mA

Construction

Primary TypePentode
EnvelopeT-3
Base MaterialGlass
SectionsSingle

Filament / Heater

Heater NotesVoltage range: 5.5V to 6.9V

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Amplifier100 V11001200000—0.7 mA

Application Notes

The 6788 is designed as a high gain audio amplifier or regulator amplifier where high plate loads are desired at low plate currents. Characterized by high resistance to interelement leakage.

Datasheets

Datasheet: 6788.pdf

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

Filters

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Manufacturers

Brands

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    Plate Voltage250 V
    Plate Dissipation0.5 W
    Grid 2 Voltage150 V
    Grid 1 Voltage-55 V
    Cathode Current5.5 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Reliable operation under severe shock and vibration
    • Extraordinary freedom from interelement shorts
    • High resistance to interelement leakage
    • Designed for guided missile service
    • Radiation resistant