Hi Greg...I also have an Alpha. I've tried several NOS tubes and like the Mullard CV4004s the best. I was actually going to sell the Alpha until I heard these tubes. It now is a 'perfect fit' in my second system. They improved soundstaging, brought out more detail and just made the music sound a little more 'analog-like' as compared to the others. BTW...these are also the tubes that Kevin Deal at Upscale Audio recommends for this unit. Good luck in your search!
