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Good. Stock tube is pretty good, and although I've rolled a better (?) tube, you don't need to. Don't be fooled by the 4 pin, is not balanced, so it's convenient, but doesn't give you any audio advantage. As with most things, you'll eventually want more power (depending on cans and ego), but realistically, this should be enough for most things, and it's good.
Curious what you mean by the 4-pin is not balanced. It seems that if it wasn't, it wouldn't work. Can you make an XLR connection work without the +/- crossover? I may be missing something, but it's kind of the definition of the format.
I know what you're saying, and I thought the same, but according to others, the 4 pin is just a convenience rather than an actual balanced outlet. Even though it has the four pins, it is only delivering a stereo signal, rather than a seperate right and left channel. I think you'll find comments in this discussion, that support (and maybe go into more knowledgeable reasons) the 4 pin for convenience factor. I know in real life, that there seems to be no difference between 4 pin and quarter inch unlike my other units that offer the choice.
Given all of that, it's a good amp, that could be better with more power, which of course, a 4 pin would give you, but I found that if you run the cth through a geshelli enog pro DAC, it's voltage output selection acts like a gain switch for the Cavelli, and more volume can be had.
I know how you feel though, I wish the 4 pin were real rather than just for convenience. Hope this helps.
Search CTH balanced in comments, and you'll find more references. ✌️
I wonder how that really works out. I hear a very discernable volume difference going from the XLR and the 1/4