I've been using Mullard EL34s in a Ming DA integrated for the last several months. They came highly recommended from Kevin Deal @ Upscale Audio. I would have to agree with his evaluation........ Excellent sounding tubes and leave nothing to be desired in an EL34.
http://www.upscaleaudio.com/product.asp?itemid=493&catid=86
http://www.upscaleaudio.com/product.asp?itemid=493&catid=86