I noticed that manu seems to like to warn purchasers fr tube rolling claiming that stock tube is matching, risky to tube rolled etc. When I had my CJ Act 2.2,I emailed CJ technical support I was not encourage to change. Anyway affer having it for abt 1+ yr and after reading some postings in audiogon I went ahead and try a quad of nos tube. Wish I have ignore CJ warning. Recently I have ordered a tron seven reference, like the designer told me their is no need to change. So don't be too concern, give it a try
