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7F7 Vacuum Tube New and Used

$12.00
7F7 Vacuum Tube New and Used
7F7 Vacuum Tube New and Used

Home / Shop

7F7 Vacuum Tube New and Used

$12.00
Model Number: 7F7NEW
High-mu twin triode 7F7 loctal vacuum tube with a 6.3V heater rating, available in new old stock (NOS) or tested used options for vintage radio repair, audio driver, and phase-inverter circuits.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The 7F7 is a high-mu twin triode vacuum tube designed for resistance-coupled audio amplifier stages, phase inverters, and voltage driver circuits in radio receivers and audio equipment. Electrically similar in characteristics to the 6SL7GT octal tube and 12AX7 miniature 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 used in mid-century Philco and Zenith radio chassis, high-gain audio preamplifiers, and electronic test equipment requiring dual high-gain triode sections.

  • Tube Type: High-Mu Twin 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 per section

  • Amplification Factor (µ): 70 per section

  • Transconductance: 1.6 mA/V (1,600 µmhos) per section

  • Primary Function: High-gain voltage amplifier, audio preamplifier stage, or phase inverter

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