Megasam. Yes, you may borrow some Purist Proteus or Dominus cables if you wish to experiment. I may or may not have the exact lengths you require, drop me an email.
Jim. I know the Pearl web site you are referring to, it is www.tubeworld.com/. I have not heard the "exact" tubes sold by these people, but I am familiar with the stock version of all the tubes listed at the site.
In the past few years, much work has been done by both Purist Audio and a well known tube supplier in this field. Their results were similar in that drastically mixed results were achieved depending on exact tube type and brand as well as circuit application.
I had the opportunity to hear several samples from these experiments, and therefore do not suggest the carte blanche cryo treatment of every tube type, especially at the prices indicated at that site. The problem is not finding good cryo processors, but knowing which tubes benefit and which tubes are performance diminished by the treatment. ( Longevity not considered ).
For instance, a tube like the Dutch Amperex 6DJ8, or the Chinese 845 benefit fairly well from a properly executed cryo process. However, the Telefunken 6DJ8, renowned for its open midrange and warm presentation is totally altered by the same cryo process. The Telefunken's personality is reduced to a bland and sterile musical presentation, removing what is so sought after by many audiophiles.
Cryo processing of audio tubes is not uniformly predictable as with wire and transformers. Like many tweaks, is a valuable tool when applied to specific situations. In short, I would be very cautious about spending what amounts to five times the asking price for a tweak that may be the reverse of what you seek.
