I had the chance to really open the amp up today, volume wise. I, too, noticed the amp getting brighter at higher volumes, and, just as you said, JJ, the presence control easily bring it back to a more controlled state. The Dyne has always sounded best at higher volumes to me. It's as if it needs a second master volume. I never let that stop me from enjoying it, though! I don't know what it is about the Lo mode on the Dyne and channel 2 on the TC, but I still get a similar vibe. Not a clone, and, yes the TC is more sensitive, but there is something underneath where I hear shades of the Dyne, especially if the Dyne is cranked.
I also pushed the gain on channel 3 up to 3 o'clock. I had to back up to stop the feedback, lol! Some may desire a flame thrower, but I don't need that much gain for what I play. 1-1:30 is perfect for what I do. I spent more time on the clean channel than any so far. The more I play this amp, the more I love it. Even with the different genres I play, the TC can cover all I need it to, and that's a slam dunk for me.
There may come a time when I will need more headroom for some gigs, and I am glad to have plenty of tubes at my disposal to swap out. But for now, the 6V6s are staying put.
Speaking of which, I have pairs of Mesa, JJ, TAD, and Tung-Sol 6V6s at hand. None of them look similar, so I can't say with any certainty who makes the Mesa tubes. They have a similar number as the Tung-Sols, but structurally they are not similar at all. Another part of this forum has a post that claims Mesa's 6V6s are Chinese even though Mesa claims they are Russian. That post also linked Mesa's 6V6s with TAD. But, I can tell you, they definitely are NOT TADs. I have the Mesa tubes in for now. I did automatically replace V1 with Mesa's SP12AX7. That's just a bad habit I need to quit, but I had a spare so in it went.
Sweetwater's review tried to say it has a long tank reverb. Clearly, they didn't look inside the head, because the tank is much smaller in the TC than it is in the Dyne. Normally, I don't really care about reverb in an amp, but for what I will be using the TC for, I am glad to report, long tank or not, it still sounds beautiful.