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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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UBL71 vacuum tube outline illustration

Tube-number record

UBL71

0 archive entries

UBL71 is a tube type in the TubeDatabase archive (class: Duodiode-Endpentode). Recorded specifications: year 1950, construction Pentode, base Glass, socket Rimlock, maximum plate voltage 250 V, and maximum plate dissipation 11 W. The archive does not yet hold a photographed example of this type.

ClassDuodiode-Endpentode
BaseRimlock
Filament55 V @ 100 mA

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections3

Filament / Heater

Heater NotesIndirekt geheizt

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Section200 V800025000—55 mA
Pentode Section180 V900022000—61 mA
Pentode Section100 V750025000—32.5 mA

Application Notes

Negative grid bias should be generated via cathode resistor. A non-bypassed damping resistor of approx 1 kOhm should be placed in the grid lead to suppress VHF oscillations.

Filters

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Manufacturers

Brands

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    Plate Voltage
    250 V
    Plate Dissipation11 W
    Grid 2 Voltage250 V
    Grid 1 Voltage-1.3 V
    Cathode Current75 mA
    H-C Voltage150 V

    Audio Performance

    Typical THD10%
    Power Output4.8 W
    Key Features
    • Indirekt geheizt
    • Demodulator system
    • Power output pentode