Oh wow! The 05 rises to another higher bar than the 120. Isn't it great when you have equipment that does that! I am interested in how you feel the HEX DAC is in comparison to the 120. I Know they are different beasts but it would be interesting as when I eventually do move back to Europe I will be looking at a home system again.
If you have a look at this..
I know my attempt is amateur and one can purchase higher quality isolation platforms but with a source of the quality of the HEX I really recommend trying some isolation with the amp. I think I have found the perfect combination of granite base to which 4 Oak cones are placed upon some Blu tak which they has a layer of marine ply on top (blu tac is top and bottom of the oak cones) then three larger oak cones are placed as you can see in the picture.
This has dropped any slight noises from tubes to zero. I truly feel the amp deserves some form of isolation to really allow it to shine even more and I can report that this form or something similar is far superior to having hard isolation as in stillpoints and such. The tubes need a visco-elastic damping somewhere in the chain which really makes them very quiet I have found.
I am so glad your enjoying the amp!