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

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Tube-number record

7489

0 archive entries

7489 is a tube type in the TubeDatabase archive (class: Low-mu double triode). Recorded specifications: brand Brimar, construction Dual triode, socket Noval (B9A), maximum plate voltage 330 V, and maximum plate dissipation 3 W. The archive does not yet hold a photographed example of this type.

BrandBrimar
ClassLow-mu double triode
BaseNoval (B9A)
Filament12.6 V @ 0.15 mA

Construction

Primary TypeDual triode
EnvelopeT6-1/2
Sections2

Filament / Heater

Heater NotesPin 9 is heater centre tap for series or parallel operation.

Absolute Maximum Ratings

Plate Voltage330 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Each Section250 V220077001710.5 mA

Datasheets

Datasheet: 7489.pdf

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

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    Plate Dissipation3 W
    Cathode Current20 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Low catastrophic failure rate
    • Special alloy cathode sleeve to inhibit interface resistance
    • Pure tungsten heater
    • Rugged electrode construction