Dolphin
If your willing to travel to Brooklyn, you can try Vintage Audio, 718-377-7282, http://www.vintageaudio.com, a friend of mine deals with them all the time and stands by them.
If your willing to purchase from the net, you can try http://www.vintagetubeservices.com/Default.htm, Andy is a great guy, a true audiophile.
Good Luck!