The New WA5 and WA5LE have balanced input and output but are still single-ended? In other words, there is no difference between single and balanced input?
Yes-- Both are still single ended.
Great summary in this article posted a few days ago-- outstanding summary:
http://parttimeaudiophile.com/2015/09/27/review-woo-audio-wa5le-v2-vacuum-tube-headphone-amplifier/