Devilboy,
My passive preamp should be home this week and the power supply next week.
Here is the website for the volume control:
www.aumacoustics.com/volumecontrol.html
The power supply is a Teddy Pardo Dual 12 - 2x12V 1A Power Supply
Richard Becker from Aum Acoustics built my passive.
richard@aumacoustics.com
He's a super nice guy.