Do you have the board and all the components or just the board? I actually like the sound of the discreet component Rev C boards, but I am old school like that. Lee, (laatsch55) and I assembled White Oak Audio Control Boards before there were any revisions, even those are far, far better than the original Phase Linear control boards. The latest Control Boards from WO are dual mono (Rev G1) and have really taken the PL400 and PL700 to the highest state of the art.
Welcome to our little corner of the PL (and Klipsch) world.
I don't care for them. They can be hit or miss. They closed down this large repair center in Chicago and ask if I wanted all the leftover parts for free. Got a lot of good stuff out of it (boxes of TO-3's) and some not so good stuff. Still haven't gone through all of it!