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Originally Posted by Dept_of_Alchemy /img/forum/go_quote.gif
Why not just buy a pair of DR 6H30Pi rather than cryo-ing the EH if that's what we're talking about.
How much is the cryo process going to cost anyway? I've heard that there's a company in Arizona that does this, do you know anything about that Penchum?
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One of the guys (from Phoenix) in a Yahoo group I belong too, has used them before for tubes. He said it is only cheap if you have a quantity to be done. He also stated that he believed the process tightens up the tolerances, which makes for the sound changes. That's about all I know.
Looking at the DR's under a magnifier, they are very well built, and you can see the distances between parts of the elements and the entire cage, are very exact and do not vary from one end to the other. Looking at the EH's, you can see gaps and changes from top to bottom.
The NOS's appear to have less (gap size) changes than the EH's. I have no idea why, but I would guess that the quality control from the 70's in Russia was better than the new productions of EH's. I still think the EH's (matched) sound better than the NOS's (matched), but I need to spend more time with them in order to say that with a high degree of certainty. The NOS's appear to need a longer burn-in than the EH's, so this may account for misunderstandings early on. Soon, I'm going to put the NOS's in my MKIVse and run the heck out of them, to see if they mature any further.
Right now, I'm running NOS's in my modded MKII, EH's in my modded MKIII and DR's in my MKIVse. I'm very happy with the results so far. I should qualify that by saying, "this isn't a path for everyone". I would not want to see everyone running around modding their MKIII's and buying 6H30's because I said so. I would be glad to PM anyone who is interested in my findings so far. I have held off posting my findings because I'm really not done yet, and I need to have this topic completely ironed out first.
