KEL84 Sound

Hello

I've just built or should I say rebuilt a KEL84. It was the failed kit that was on Ebay a while ago. It sounds very good, especially with some very cheap recent Gale speakers and also via an old pair of Stax headphones.
My main set up includes a pair of Quad ESL63s and a Quad 99 power amp.
It sounds very good with these also (the speakers), maybe more detail than the Quad, but far more bass-light and definitely recessed in the midrange.
I had the wiring problem where the output transformers were wired the wrong way around, so sent positive rather than negative feedback into the amp causing it to oscillate. I had to wire these the opposite way around, would this make any difference to the sound? Or could it be the 63s are too much for the 84s to drive? How would you describe the sound of the KEL84?

I also have a mains transformer that likes to join in with the music... but that's another story.

Richard