JLH-10 - Class-A PA


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JLH-10 is the classic 1969 John Linsley-Hood circuit of a solid-state 10W class-A power amp designed to have a tube-like sound.

  • pure class-A
  • only four transistors
  • single rail operation +27V (8-ohms)
  • everything on one small board
  • 10W into 8-ohms
  • 15W with 38V supply
  • board size 2.9x1.8" 71x46mm

JLH-10 is the classic circuit built with modern devices while retaining that classic sound. JLH-10 uses modern high-temperature long-life capacitors, metal-film resistors, modern TO-264 output devices and a heat-sinked TO-220 driver.

Make sure to use a very large heat sink for this project!

JLH-10 FREE (263KB) includes enough information for the home hobbyist to make his own printed circuit board. The free JLH-10 FREE download includes the following PDFs:

  • schematic
  • parts overlay
  • top foil
  • bottom foil
  • bill of materials

Click HERE to download JLH-10 FREE.

JLH-10 COMPLETE (2,114KB) contains all of the information above, plus a detailed PDF explaining how the design works, how to substitute other components, how to wire it correctly, how to design and build the power supply, how to use JLH-10 in a home theater system, gerber and excellon files for professionaly manufactured boards

JLH-10 COMPLETE includes:

  • schematic
  • parts overlay
  • top foil
  • bottom foil
  • comprehensive notes - 14 pages
  • power supply schematic and wiring
  • gerber and excellon files for PCB manufacture
  • safety notes

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

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PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA