I've built a couple of Baby Blue ODs and used through-hole 2N5952s - I got them from Mouser and bought a bunch at the same time. I like the Baby Blue - it works really well with a Gibson. Not so well with my Strat but that's ok! Not many ODs work with my Strat... It's a kinda fuzzy OD with plenty of mids and is a lot of fun to play.