So I finally hooked up the HE5s to the speaker terminals of my Ming Da integrated (13W, EL84). Compared to my LD MK IV SE (which was no slouch) they sound like new phones. Much more open, detailed. Volume pot only @ 9-10 o'clock.
(This is using the stock cable & tubes). I'll upgrade the cable & roll some tubes in future, but happy for now.
If you have HE5s I can highly recommend trying out this route.











