Impressions of the Re-issued Genalex Gold Lion U77/GZ34 Rectifier Tube

I know that this is an old post but in case someone still reads it (like me) I have to ask this: cyro freezes everything in the tube and then comes back to a normal temperature. So then the tube goes into its circuit and gets heated. So can someone who is better trained than me (which is about 99% of the people out there) tell me just how they can say for sure that the cyro is working? Did anyone hear the tube before the cryo and then the same tube after? If so, how does the cryo rearrange the molecular structure and keep it the same once the tube heats up for the heat will affect the molecular structure the same as the extreme cold, will it not? When NASA does their cyro on the parts they use, are those parts exposed to very high heat over and over again  such as a tube in a circuit or are they a "one and done" application?

Curious as to thoughts / explanations...and thanks...

ZK

We'll never know. @geoffkait doesn't hang in the forum anymore (as far as we know.)

You guys are so mean.  A little humillity about the subject on both sides might be in order. I'm willing to concede to either side with some relevent data. I never saw a technical explaination for or against cryo treatment.  Everything said was hearsay and anecdotal and none of it convincing either way.   

Give me the physics please.  After all heating steel and quenching quickly  adds strength why is it so hard to believe that something you may not happen to know might happen in the other direction. Approaching absolute zero transforms many materials into super conducting states. Cryo is far colder than -40 F. Cryo is closer to AbZero than -40 F

BTW When I say say heating steel I'm not talking about leaving it in your barn over the summer.

I wish @geoffait would come back I want to hit him up for some of those Nasa tubes 😉

Ok so I asked Mr. Google and he said, according to the article link, that cryo treament can help certain things. Vacuum tubes is probably not one of them

Cryo takes materials down to at least -190 C.  No barns in the US go down that low. Cryo treating  actually realigns the crystaline structure of steel and other materials.  Untreated steel has  a variety of steel crystal configurations.  Cryo literaly squeezes everything down to one uniform, the most stable, crystaline configuration. This improves strength and electrical conduction. It is assumed that this happenes in other materials but the engineer did not go to deep into that.

Ok so  with a single material cold can be good, everything changes together, no worries. However....tubes are assemblages of several different parts made up of several different materials each with their own physical properties. All of these components are bonded together with various tolerences. If you freeze an assemblage like this everything freezes with differing rates and results. Now try to thaw it out....again with differing results. So this complicated assemblage now at operating temperature may not be bonded together the same way any more.  It is no longer really at the same spec as when manufactured. Makes sense to me!

This guy did offer some hope.  His idea was that after cryo only the strong survive.  Stuff that warms up and is no longer in spec fails relatively quickly so that only superior tubes live on.

I think that opens the door for another question though. What if the thing that cryo breaks is the thing that makes the tube sing?  Remember when the tornado swept up Dorothy's house?  The old bat was still flying.

Now you guys stop fighting😃