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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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5BQ7A vacuum tube outline illustration

Tube-number record

5BQ7A

0 archive entries

5BQ7A is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand TUNG-SOL, year 1957, construction Dual triode, base Button, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.

BrandTUNG-SOL
ClassDouble Triode
BaseNoval (B9A)
Filament5.6 V @ 450 mA

Construction

Primary TypeDual triode
EnvelopeGlass
Base MaterialButton
Sections2

Filament / Heater

MaterialCoated Unipotential Cathode
Warm-up Time11s

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier - Each Triode150 V64006100399 mA
Push-Pull RF Grounded Grid150 V———10 mA

Application Notes

Intended for use as the first RF amplifier tube in tuners of VHF television receivers or as a low noise IF pre-amplifier tube in UHF television receivers employing a crystal mixer.

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Heater Notes
    AC OR DC

    Absolute Maximum Ratings

    Plate Voltage250 V
    Plate Dissipation2 W
    Cathode Current20 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Medium-mu double triode
    • Controlled heater warm-up cycle
    • High transconductance
    • Low input capacitance
    • Low input loading
    • Low plate to cathode capacitance