After 5 years collecting parts, machining, pre-fitting and painting this project was finalised in 2009.

The electrical design is taken directly from the Pass Labs Aleph 2 schematics without modification, except the power supply.

The power supply (2 x 55V) is unregulated:
- 1 kVA toroid transformer
- 130A Schottky Diode Rectifier
- 132000uF - 2.7mH - 66000uF CLC filter on each rail.
- The inductors in the voltage rails are air-core, but magnetically coupled to create a "soft" common mode filter.

Under 500W load, the 50Hz ripple is below 10mV

The heatsinks are sized to dissipate 330W in free convection (no fans) with a temperature rise of less than 20 degrees above ambient.

The painting was done by an industrial paintshop, with BMW metallic paint.

The sound is -in one word- great!

Comments

• baka
• 11 February 2011 at 03:56AM
• Verry nice project and for me is masterpiece.

• lvcas
• 26 May 2011 at 04:45PM
• very good!!!!!

• WitchdoctorGaz
• 26 May 2011 at 07:49PM
• Gorgeous work, and so professional - no wonder it took 5 years to complete!

• Duck-Twacy
• 19 June 2011 at 09:50AM
• Very nice Bouke.
  Must be very heavy two.

• TwistedPair
• 13 December 2016 at 06:38AM
• Stunning look and build...

• RomanescuGxG
• 9 March 2022 at 01:35AM
• HI, this is only for 1 channel, correct ? 2x55V is DC output ?
  Thanks