Brad ,the Zero`s are working great, I` m using my Meadowlark shearwaters now , and there kicking some real great music right now. I had Mark send me the 12au7 he is using in the Magnum 66, I`m running it right now. Its still to early to tell about this tube , it might do as well as the E80cc, we`ll see.Did you get a hold of Paul about tring the Zero`s with your system. I wish I still had my Maggies to try with this amp and the Zero`s, bet it would have been AWESOME