I absolutely love my TA-15. I run mine Ch 1 clean for that crisp, clean tone and I run Ch 2 in Hi 1 because the tube breakup is so, so rich. Running it into a Mesa Widebody 1x12 open back with Black Shadow Celestion 8ohm.
I run my Hi 1 gain at noon for when I'm playing Pearl Jam, Stones, U2...