Tubes:
I put together both the Cornet2 and the Chime as Octal units because I had a decent supply of 6SN7 tubes.
I am currently using the 6SN7W Sylvania chrome tops and Mullard ECC32s. In my system they give a smooth detailed sound.
I have also used various VT-231 (Raytheon, Ken-Rad and Sylvania). These are very nice.
A tube I have begun to experiment with is the Russian 6H8C with nickel base. Very promising to my ears.
For the 12AX7 I have some Telefunken pieces which are excellent.
Hope this helps.
I also hope you get the chance to do your octal Clarinet. The 6SN7 works well in my Ultrapath linestage
Best
Bob