6922 Tubes!

Even though there claim to being an affordable process, I'm not sure what there definition means. I say this based on the cost of there cables, etc.
I'm considering cryo treatment for some tubes I have, more for increasing the longevity then SQ since NOS tubes are getting more and more expensive and harder to find. Of course any benefit in SQ would be a plus.  I need to do some further research regarding cryo of tubes.
I remember reading somewhere that due to the difference in the temperature coefficient of materials the process ruined a set of IC's; the shield contracted greater then the conductor and or dielectric. JENA claims that there liquid process obtains temperatures much lower then the gaseous process.

Actually I think the term "expansion/contraction coefficient of materials" should replace the term "temperature coefficient of materials" denoted in my above post

Liquid nitrogen is actually not much colder than nitrogen vapor. I also suspect Jena Labs uses the vapor for most of the Cryo process with a dip into the nitrogen liquid for a brief time at the very end. Otherwise thermal shock would be an issue. Furthermore the temperature difference between vapor and liquid within the dewar is only around 20 degrees F so there may be a bit of an exaggeration regarding the temperature advantage of direct submersion. Of course even lower temperatures could be achieved by pressurizing the dewar. In addition, the ramp down time, dwell and ramp up times are probably more significant than the temperatures in terms of effectiveness. Thermal shock would almost certainly occur if the tube or cable or whatever was immersed in liquid nitrogen right away without the slow ramp down and dwell times in vapor. Another indication that temperature per se is probably overrated is that very good results can be obtained with the home freezer, leaving the tubes or cables or whatever in the freezer for 48 hours. You can even ramp up in the main refrigerator section for 6 hours. I estimate that home freezing at -10 F can get within 80% of the results of real -300 F Cryo. Tell all your friends.

Geoff, Is your information about the putative benefits of refrigerator and home freezer temperatures based on real world direct experience or on what you have read elsewhere?  Back when I did some reading on the physical effects of cryo treatment, it seems to me the papers I could access state that there is no effect unless you go "all the way".  And I even think liquid nitrogen is not technically cold enough, but I may be wrong on that last bit.

Wiki says that cryo treatment of "metals" occurs at temperatures less than -190 degrees C or -320 degrees F.  N liquifies at -195 C/-320F.  At temps below -210 C/-346 F, LN freezes.

So, it does appear that the benefits of cryo treatment can be achieved at temperatures "around" where N vapor becomes LN.  Nothing on the internet about home refrigerator or freezer temperatures, however.