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75 Vacuum Tube New and Used

$11.50
75 Vacuum Tube New and Used
75 Vacuum Tube New and Used

Home / Shop

75 Vacuum Tube New and Used

$11.50
Model Number: 75NEW
75 duplex-diode high-mu triode tube with top grid cap, 6.3V heater, and 6-pin UX base.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The 75 is a classic 6-pin UX-base duplex-diode high-mu triode vacuum tube introduced in the early 1930s for superheterodyne radio receivers. It integrates two signal diodes for detection and automatic volume control (AVC) with a high-mu triode section for audio preamplification in a single envelope. Designed with an ST-12 shoulder glass envelope and a top cap for control grid isolation, it operates on a 6.3V heater. The 75 is the 6-pin predecessor to octal types like the 6B6G and 6Q7. Available NOS and tested used.

  • Type: Duplex-Diode High-Mu Triode (Detector / AVC / Audio Voltage Amplifier)

  • Base: 6-Pin UX Base (EIA 6A layout) with Top Grid Cap

  • Heater Voltage: 6.3V

  • Heater Current: 0.3A

  • Max Triode Plate Voltage: 250V

  • Max Triode Plate Dissipation: 0.5W

  • Amplification Factor (Mu): 100

  • Transconductance: 1100 micromhos (1.1 mA/V)

  • Equivalents & Relatives: 75, 2A6 (2.5V heater version), 6B6G (octal equivalent), 6Q7 (octal relative), 6F5 (triode section equivalent)