CJ Premier 15 & 17LS Tube Suggestions

I have been using a conrad-johnson premier 15 phono preamp for about 18 months and just purchased the premier 17LS preamp six months ago. I am very happy with this pair except for what I consider to be excessive tube noise from the stock tubes. With the 17LS set to mid-range (50 on the display), I hear, what I think is excessive tube noise for units at this price range. I haven't had time yet to experiment (too much travel) with different tubes. I am looking for suggestions for low noise tubes (and sources of tubes) that would improve upon the stock tubes I am currently using. Any suggestions for different brands of tubes and where I can get them would be greatly appreciated. Thanks in advance for the help!