Hifigeek1,
I believe they probably do, but to be certain I would email: jimmcshane@prodigy.net and ask him. Also, Jeff Day (6 moons, Positive Feedback) has written extensively about this tube; he has a nice blog where he compares this tube in his Leben against many other tubes in this family.
I believe they probably do, but to be certain I would email: jimmcshane@prodigy.net and ask him. Also, Jeff Day (6 moons, Positive Feedback) has written extensively about this tube; he has a nice blog where he compares this tube in his Leben against many other tubes in this family.

