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.
6922 Tubes!
Hi everyone, There are many old threads about the 6922, I wanted to know what people are using currently that wont break the bank, ( ie...$150 per tube seems a lot). I need to buy 4 new ones for my phono preamp. Should I just order a set of tubes from the manufacturer (Manley Labs) it seems they like to use Electro Harmonics and they are very affordable, so what does a $100 tube do?? because the originals were pretty nice sounding. I just dont want to overspend on tubes for the unit/system im using them in. Help.
Matt M
Matt M