I just broke in a cryo'd quad of these from cryoset.com in the Torii Mk III in my main system. I had been using a cryo'd quad of Tung-Sol KT-66 prior to that. Both of these brands of these tubes sound awesome in the Mk III, I prefer them to EL34 types and even to the JJ 6CA7 that I had been using. The Tung-Sol offer a huge open sound; the Genalex offer a slightly less open more "classic" sound in my system, a hint of richness the Tung-Sol doesn't quite offer. I liek them both (the Tung-Sol are currently in my second system and may end up in the Torii Mk II that I have in my Dad's system).

I say try them out. Consider buying from cryoset--I have had great results with their cryo'd tubes, and their service.

http://www.cryoset.com/catalog/product_info.php?cPath=22_84&products_id=125&osCs...