Re-biasing a CJ Premier 8

Since you are just starting out with these amps, I would suggest the Svetlana (SED) flying C. They are very reliable and produce a fairly balanced tone. The KT90's may have tighter bass and maybe a bit brighter tone - my biggest reservation is about the reliability of current production KT90's. Sonically, its your choice.

I used Ei KT90s in my Elevens very succesfully. They seem to be loved by many.

Enjoy your Eights; they're fabulous amps

BTW, I think you meant 'retubing'.
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I'm sure you meant 8 per side. I also say, use the old tubes to get a fix on what they sound like---then you will notice the dif. when you do retube.

Fernando,the friend of mine using the Premier 8 is a former reviewer for TAS.I had the retubing discussion with him,and,he continues to use the tubes supplied by CJ themselves.He had spoken with Lew Johnson who feels the stock tubes are fine.This is not to say that tube rolling won't be better,but it could save you some money,as well as the possibility that you may actually get best performance from CJ's own stock.