I recently got a tip from “Roxy54,” a fellow on Audiogon who owns an ANK Kit 1 10th Anniversary Edition that Digital Pete Fulton built for him. This is the Kit 1 version with the top-of-the-line capacitors and the very expensive AN C-Core transformers. Ooh, la la!
Roxy said that he purchased a slightly used, vintage RCA 6SN7 tube (the middle tube on the Kit 1’s Driver PCB) from Andy at Vintage Tube Services. (The web site contains a lot of cool historical and other information about the vacuum tube industry and is worth checking out.) Roxy raved about the sonic improvement over the stock, Electro Harmonix Russian tube that ships with the Kit 1 and suggested that, for a measly $46, I pick one up, too.
I had a good time talking to Andy and ordered one of these tubes. It should be arriving soon and I’ll post again when I’ve had a chance to try it out.