I don't believe cryo treatment is worth the extra cost.
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I recently tried SED cryod el34 ..If you need extra warmth you'll get it! The Cryo SED is quite a bit warmer than the regular SED el34..My Cryo quad was put into service for maybe 100 hours and couldn't stand it anymore and put them back in the box...Just keep in mind if you like the tone of your current SED el34 your in for a change ...I didnt like em...Still sitting in the box....................
Thank you for responding.
Thorman - This is the first time I've heard about the additional warmth factor. Has this been your experience with audio cryogenics in general; Geoffkait's impression is more typical of what I've heard.
Tvad - As Geoffkait and Dbld pointed out, there are less expensive alternatives. Have you ever found cryoing to be beneficial and cost effective?
Phaelon: When I inquired about the SED el34 cryos at ( tubedepot.com )I was told they would definately be sweeter in sound..but in my system they made me also change other ( brighter ) tubes to offset the extra warmth that the cryod el34 were giving me..I then went back to my Original SED el34 quads and I got back the detail and midrange I was used to...For me it was a bust..For double the cost it aint worth it.....For me anyway!
I bought the regular Winged Cs and FWIW, the person I talked with on the phone didn't recommend the cryo'd version. In fact, in his opinion, the only benefit that he could discern is that the cryo process "weeds out the weak". But as usual, I'm sure that results are system dependent and for those who hear improvement, it's worthwhile. Thanks again for all the great input.