Hi Jeb - I found a beautiful pair of the Hytrons (mid 1950's w/elongated bent getters natch) and installed them in the WA7 immediately. Talk about lightning in a bottle, they are indeed superb - my new favorites! I can't believe how much they improve the T1 in soundstage and isolation of instruments. I prefer them over the Mullards, and I do love my Mullards! The CBS - Hytrons also burn with a glow like no other 12au7, gorgeous tubes.
5/23/15 at 1:41pm