AMP-25 - 25W Tube Power Amp with Matching Power Supply


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AMP-25 is a 25W tube power amp with a matching power supply.

AMP-25 is comprised of two elements:

  • Our PA66-25 Push-Pull Power Amp using standard octal-based power tubes
  • Our PSU-25 Super-Quiet Power Supply for tube amps

  • toroidal output transformer
  • toroidal power transformer
  • Japan-compatible 100-120-240V mains
  • uses 12A_7 for front-end
  • safe voltages for NOS tubes (420Vdc)

If you buy both PA66-25 and PSU-25 kits separately, the combined price = $626, but the price of AMP-25 = only $564. Save $62!

This amplifier can use any of the standard octal-based power tubes, or even mixes of tubes. The power supply provides all the voltages required for a tube power amp and preamp, along with auxiliary voltages for switching circuits or opamps.

See the detailed descriptions of the two kits:



Kit requires assembly. If you would like this kit assembled, add PSU-BLT to have the power supply portion pre-assembled, and add PA-BLT to have the power amp portion pre-assembled. The transformer fly-leads will NOT be attached to the boards. The assembled boards are bulkier than the loose parts, so shipping is slightly higher.

AMP-25 can be combined with any London Power tube preamp kit (D-PRE, F-PRE, LP-PRE, M-PRE, S-PRE, V-PRE, Z-PRE), effects loop kit (BFX), and/or reverb kit (REV, REV-COMP) to create an integrated amp.

Add GND Ground-Link-Isolator to avoid ground loops with other mains-powered equipment.

Use two AMP-25s for stereo.

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