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RE: in your experience...

Posted by alan m. kafton on May 23, 2012 at 13:04:28:
Completely safe, with two caveats.

Firstly, know that there are different cryogenic processes performed by differing companies, both as to the control method of ramp-down and ramp-up of temperature, and to the depth of temperature.

While I vastly prefer using a facility that treats materials at -320F (the sonic results are superior, imo), a facility that only went down to -295F or -300F would be acceptable as long as their ramp-down and ramp-up control was tight and extended (meaning very long and gradual). This ensures the materials will not be shocked by any rapid fluctuation of temperature.

Secondly, and especially on older NOS tubes, there is no guarantee that the vacuum seal on these tubes is perfect (and dependent on the adhesive used, if any), and therefore there could be a failure. It's not happened to me in the 12+ years of my experience, but it's always a possibility. This is not the fault of the cryogenic facility, but the fault of the original manufacturer. Just something to be aware of....