Check out the chart below, don't be afraid to try different settings to find what sounds best to you. Also, I have rolled in a dozen or so different 12AX7 tubes and have found vintage Telefunken12AX7's sound best to me. Have fun with it.
https://www.audiokarma.org/forums/index.php?threads/official-jolida-jd9-thread.344317/page-104
https://www.audiokarma.org/forums/index.php?threads/official-jolida-jd9-thread.344317/page-104