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7B4 Vacuum Tube New and Used

$3.00
7B4 Vacuum Tube New and Used
7B4 Vacuum Tube New and Used

Home / Shop

7B4 Vacuum Tube New and Used

$3.00
Model Number: 7B4NEW
High-mu triode 7B4 loctal vacuum tube with a 6.3V heater rating, available in new old stock (NOS) or tested used options for vintage radio repair and audio preamplifier circuits.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The 7B4 is a high-mu single triode vacuum tube designed for voltage amplifier stages in radio receivers and audio equipment. Electrically equivalent to the 6F5 octal tube, it features a 6.3V filament rating and an 8-pin lock-in (loctal) base in a glass envelope construction. Manufactured by companies including Sylvania, Philco, RCA, and GE, this tube was widely utilized by Philco and Zenith in mid-century radio chassis. It provides high voltage gain in resistance-coupled audio driver circuits and preamplifier stages.

  • Tube Type: High-Mu Single Triode

  • Base Type: Loctal / Lock-In (8-pin)

  • Envelope Style: Glass T-9

  • Filament Voltage: 6.3 V AC/DC

  • Filament Current: 0.3 A (300 mA)

  • Maximum Plate Voltage: 300 V

  • Plate Dissipation: 1.0 W

  • Amplification Factor (µ): 100

  • Transconductance: 1.5 mA/V (1,500 µmhos)

  • Primary Function: Resistance-coupled audio voltage amplifier or preamplifier stage

  • Condition Options: New Old Stock (NOS) or Tested Used