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

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UBF89 vacuum tube outline illustration

Tube-number record

UBF89

0 archive entries

UBF89 is a tube type in the TubeDatabase archive (class: Combined Double Diode and Remote-Cutoff Pentode). Recorded specifications: brand TESLA, construction Pentode, base Glass, socket Noval (B9A), maximum plate voltage 200 V, and maximum plate dissipation 2.25 W. The archive does not yet hold a photographed example of this type.

BrandTESLA
ClassCombined Double Diode and Remote-Cutoff Pentode
BaseNoval (B9A)
Filament19 V @ 100 mA

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections3

Filament / Heater

MaterialOxide
Heater NotesSerial supply (AC or DC)

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
HF/MF Amplifier200 V4500600000209 mA

Datasheets

Datasheet: UBF89.pdf

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

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Manufacturers

Brands

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    Plate Voltage200 V
    Plate Dissipation2.25 W
    Grid 2 Voltage200 V
    Grid 1 Voltage-1.3 V
    Cathode Current16.5 mA
    H-C Voltage150 V

    Audio Performance

    Key Features
    • Combined double diode and remote-cutoff HF pentode
    • Internal shielding connected to cathode
    • Separate diode systems (except shared cathode)
    • Suitable for HF, MF, and LF amplification and AM demodulation