T+A is excellent, but with a frustratingly sparse dealer network.
Probably not as wide of a dealer network as some other more popular brands, but definitely not sparse. And the North America T+A rep, David Schultz is very helpful. There are two authorized T+A repair centers in US, East Coast (Georgia), and West Coast (California).
As for dealers, see link below. Just type in “United States” under “Place / Country” (second box from left):
https://www.ta-hifi.de/en/dealers/
Then, Scroll down below map for full list of authorized dealers