I'm pretty sure they still do. I think around Threshold or so they were using a Savage and an Special EL34 in the studio - don't quote me on it though.
Other bands that have used ENGLs for their sound:
Accept (newer albums), Rammstein, In Flames (at least on Come Clarity), Dimmu Borgir (don't know when they started, but at least on Death Cult Armageddon). I think one of the guys from Black Dahlia Murder has an Invader, but I don't know if they ever were endorsees.