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

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KT90 vacuum tube outline illustration

Tube-number record

KT90

0 archive entries

KT90 is a tube type in the TubeDatabase archive (class: Audio Power Pentode). Recorded specifications: construction Beam tetrode / beam power, base Octal, 8 pins, socket Octal, maximum plate voltage 750 V, and maximum plate dissipation 50 W. The archive does not yet hold a photographed example of this type.

ClassAudio Power Pentode
BaseOctal
Filament6.3 V @ 1.6 mA

Construction

Primary TypeBeam tetrode / beam power
EnvelopeGlass
Base MaterialOctal, 8 pins
SectionsSingle

Filament / Heater

Heater Notes+/- 0.6 Volts AC or DC

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Connection 1250 V1400011000—145 mA
Pentode Connection 2400 V880025000—90 mA
Triode Connection250 V150006509153 mA

Application Notes

Primarily designed for use in audio frequency power amplifier applications.

Datasheets

Datasheet: KT90.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 Voltage750 V
    Plate Dissipation50 W
    Grid 2 Voltage650 V
    Grid 1 Voltage-200 V
    Cathode Current230 mA
    H-C Voltage300 V

    Audio Performance

    Power Output160 W
    Key Features
    • Anode dissipation 50W
    • 110W output per pair in push-pull at 550V
    • 160W output per pair at 750V anode / 600V screen
    • Recommended replacement for 6550, 6550A and KT88