REview the World Tube Portal Directory; here is the link to Tube Kit suppliers. Some of the links are outdated but many work just fine. Audio Note offers a good price range of kits ranging from a basis 6550 based amp to a parallel 300b SET amplifier.
http://www.worldtubeaudio.com/directory/categories/kategorie_8.htm
The Welborne Lab kits are attractive, too, and a good design for the price point.
http://www.worldtubeaudio.com/directory/categories/kategorie_8.htm
The Welborne Lab kits are attractive, too, and a good design for the price point.