Just for sharing experience with some tubes tested with the Eclipse if that can help someone, here is an update :
Set 1 : a quad of Tesla ecc802s : clear and airy sound but the global sound miss of charm/intensity with a lack of bass. So I let them running about 50 hour for a burn-in but a result doesn't change a lot.
Set 2 : a quad of E80CC Valvo : nice sound and nice airy spacialization and deep scenary, warm without exces, maybe a bass a bit discret if I compare with the 6211 Telefunken
Set 3 : 6211 Telefunken in input and the E80CC in output, nice set that combine the best part of these 2 pairs
Set 4 : 5814A GE 5 stars in input and the same E80CC in output, these 5814 provide a better natural sound from bass to trebble, a bit more bass than the 6211 and a better open scenary, more and clearer micro information such as applause in live recordings.
So my favorite is set 4... at the moment.
Please note that as you know it depends on your own taste, equipment we have and the condition of the tubes as they are all NOS.
Have a nice time