It is ETF time again and this year the promoters took into consideration 'Birthday Month' so Jackson and Slagle are going with mercury and nickel. This year the competition is for a preamp power supply and 16 different designs will have at it. Of course a little pandering to the judges always helps!
Quad QA12/P Amplifier - This is pretty close to Quads first amplifier. I got to put my hands on one of these once very cool early British amplifiers. http://www.itishifi.com