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RE: What ever happened to cryo treated tubes?

A few points:

pin to glass seals are determined by material selection and manufacturers select material which have similar thermal contraction and expansion rates

Nothing is soldered internally within a tube envelope. Only soldering is for power tubes to attach the lead outs to the base pins

Good cryo techniques utilize a very slow ramp down and an equally slow ramp up so that the materials are at the same temperature.

The grooves you refer to in the grid post are cut with a slitting machine and the grid wires inserted into the slit, The slits are then mechanically burnished down, As for freezing priority see point above.

As for metal transformation see the effects of cryogenic treatment of steel, Nickel which makes up most of the plate structure is essentially nickel.

NOTE I am not attempting to refute your points , just pointing out certain incongruities in your argument(s).

It should be noted that for outgassing of tubes, a certain amount of molecular air is dissolved molecularly within the materials used in construction. One wire manufacturer with whom I have spoken to, told me cryogenically treating copper increases the purity of the base metal by the contracting of the metal which literally squeezes out some of the dissolved gas. In a tube, of course this gas will still be contained in the glass envelop but then the getter has better access to the gas for absorption.

Any way, food for thought.


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