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5BR8 Vacuum Tube New and Used

$4.50
5BR8 Vacuum Tube New and Used
5BR8 Vacuum Tube New and Used

Home / Shop

5BR8 Vacuum Tube New and Used

$4.50
Model Number: 5BR8NEW
5BR8 triode-sharp cutoff pentode vacuum tube for radio and TV VHF oscillator-mixer and tuner stages, featuring a 4.7V heater and 9-pin miniature base.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The 5BR8 is a 9-pin miniature compound tube containing a medium-mu triode and a sharp-cutoff pentode in a single envelope. Engineered for VHF oscillator-mixer, sound IF, and video amplifier stages in television receivers and radio front-ends, it operates on a 4.7V/600mA controlled warm-up series heater. It was frequently specified in late-1950s series-string chassis designs by manufacturers like RCA Victor, Zenith, Philco, and Admiral. Available in NOS and tested used conditions.

  • Type: Medium-Mu Triode / Sharp-Cutoff Pentode (VHF Tuner / Oscillator-Mixer)

  • Base: 9-Pin Miniature Noval (EIA 9DC layout)

  • Heater Voltage: 4.7V

  • Heater Current: 0.6A

  • Max Plate Voltage (Triode / Pentode): 250V / 250V

  • Max Plate Dissipation (Triode / Pentode): 2.0W / 3.0W

  • Transconductance (Triode): 8,500 microsiemens (8.5 mA/V)

  • Transconductance (Pentode): 6,500 microsiemens (6.5 mA/V)

  • Equivalents: 5BR8, 6BR8 / 6BR8A (6.3V equivalent), 5CL8A (similar series heater pin layout)