Happy New Year!
The tubes of course don't care what frequency they distort
You could try to find a TAC 16/8/2. They look a bit clumsy and are not modular, so maintaining them is a bit harder. But there´s nothing special inside and if recapped they sound just beautiful.
Are Calrec consoles hard to keep alive?
The Toft is cheap Chinese crap, I definitely wouldn't go there!
I'm looking for a small modular console like Amek BC2-3, Calrec Minimixers, Cadacs, Trident fleximix and similar..
Apart from the fact that the pots will all fail in a couple of years. Thats my experience.