Hi Mike,
Thanks so much for your very thoughtful post.
Your right regarding the “wattage mire” as being from the technical repair, measurement camp I do tend to get fixated on that. I have had poor experiences in the distant past with some tube equipment trying to drive my earlier U1’s, hence the present concern.
Will report back once everything is up and running, and you are right, I’ve not heard the MA2’s on any SL’s up to this point.