The reigning Tube King is still Andy Bowman at Vintage Tubes Services (616-454-3467 www.vintagetubeservices.com). Call the other "so called" tube gurus FIRST and then call Andy who will debunk the myths, lies, and ignorance that abound at other places. And forget about Kevin Deal! Currently, his premium NOS tubes are limited to customers who buy tube equipment from him! Also, don't forget the most important tubes, the line level and driver tubes. These will have a much greater effect on sonic improvement than your power output tubes. Happy Tunes!