^ what he said. I'm currently using Jupiter interstage caps in mine (.1uf), and have tried Russian FT-3's and a few other fancy caps. They are by far my favorite in that position, i posted more about them in my rambling thread on the Bottlehead forum. I really like the Jupiters because of their natural sound and transparency, so much so i have used them in a few other amp builds since then. The FT-3's are unbeatable for value, about $8 for a pair, vs the Jupiters at $30-40 each. For the output caps (1.5uf) i am using Mundorf SIO.