MC275 Tube Rolling...

The folks at Grant Fidelity have asked me to update the link to the Shuguang Treasure series KT88 which appears in my previous post. The new link for these tubes is http://grantfidelity.com/site/Shuguang_Treasure_KT88-Z

Thanks for such an interesting comment! I've a MC275 MKV and I would like to retube it. Now, my main concern regards bias, as I've been told that electric parameters between valves can change significantly. In a nutshell, I would love to replace factory tubes with Genalex 12AX7 and 12AT7 and Genalex KT88 or Shuguang Treasure KT88 or Tungsol 6550 instead of factory KT88, but I'm quite scared of potential bias consequences if it can cause any harm to my beloved Mc.
Could you kindly give me some suggestion or assurance before deciding what to do as you seems much more expert than me....
Many thanks

Lots of talk about this tube so I bought a quad set; hopefully, what I've read will be duplicated in my system...

5 years later, I have settled down to the following tubes...

KT88 Gold Lion
(will try black treasure one day)

V1 (12AX7A)
RCA GP 12AX7A

V2,5(12AX7A)
Mullard Blkburn GP 12AX7A

V3,4,6,7 (12AT7)
Sylvania Gold Brand TMBP 12AT7wA (aka 6201)

Tell us, please, what you hear with the new tubes?

Thanks (RWD)