I have a Chenin since first quarter of 2004. Went astray with the tube rolling threads and spent tons of money on the so called "recommended" tubes. Garbage!
I never like the 6106 and have some reservations on the Tungsol RP (still have the tubes) on my preamp. The 6106 does weird thing in my phono section. To me I found my heaven with Raytheon 6SN7 and/or EH 6SN7, Sovtek KT66 or 6L6GC rectifiers, and Mullard M80/Amperex D getter 6922 on phono. For rectifier, nothing sounds better to me than a good old double d or O getter GZ34. Its been almolt two years now since I refuse to roll tubes in my preamp.
The Supratek uses the 6SN7 in SRPP topology, transformer coupled to the output. If you read more about the topology and understand the circuit operation, you will be safe from spending a lot of money rolling tubes IMO. For example, you have to realize that changing the rectifier changes the OP of the tubes because the change is transparent to the B+. The sound changes, as perceived by the listener, not because the rectifier have blackplates, gold pins, and all the BS etc. What I cannot believe on the thread here in Audiogon was that someone posted improvement by changing the umbilical cord. Gimme a break!
Nevertless, I am at peace with my Chenin. I still love it but I do not use it as often but as a back up because the preamp I made sound so much better then the Supratek with the system I currently have. I never tried comparing the two with my other system set up though.