Oh, and I went to my dealer today and he confirmed that you DO NOT have to have a matched quad for the Leben. He said it'd be fine to just throw another Sovtek in there and let the amp do the work.
That being said, he didn't have any Sovteks on hand (he thought he did) so he gave me a new quad of JJs EL84. I've heard mixed things between these 2 when it comes to EL84s and don't really care one way or the other.
I'm hoping to eventually roll in something else and keep this quad as a backup anyway.
Was always my understanding that the Leben did not require matched tubes, so that's good verification. In any case, what a lot of sellers call "matched" really aren't necessarily, as real matching requires more than just an average tube tester.