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Hmm thats odd that you say the WA5 is good at driving the HE-6. I used to have that amp for a while and tried the HE-6 prototype on them and the matching was actually quite bad. It didn't have anywhere near enough power for those headphones. To me, the WA5 is actually a lot picker than I thought with headphones. It sounded completely wrong with the sony R-10 and the Thunderpants. As for LCD-2, it is a pretty good match, but way too lush sounding.
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The production version is supposed to have better efficiency than the prototype that was sent around in loner program, isn't it?
This is interesting, maybe the difference in efficiency between the prototypes and the production version was that the HE-6 was improved to make them as efficient as the K1000. I own an HE-6 and have tried the protos, but I haven't had a chance to listen to the WA5 personally. That's good to know about its pickiness, as I had generalized that it was quite versatile from reading about it in the Woo thread.
Likewise I have read a few posts from a couple of HE-6/WA5 owners that seem quite satisfied with that pairing, pretty sure they are Frank I and SillySally but not positive. I wonder how much of a difference different tubes would make with the LCD-2 for example. Have you listened to a K1000 out of the WA5's K1000 jack?