Cryogenic Treatment of Tubes, and why you should not.

I have received cryo'd tubes that  had 2 out of 6 cracked in shipment even though they had been wrapped in foam. My impression was that the metal/glass interface may be the weak point.

Prevalent 

For F1/Moto GP piston rods that must endure 15K RPM- sure.

Vacuum tubes- another audiophool extravagance?🤣

I read the Effectrode paper a few weeks ago - I own a number of their effects pedals.

As with everything from the company, comprehensively researched and argued.