even i can detect BS when it gets heavy enough. check out this "cryogenic process" used to inflate the prices of vacuum tubes here https://www.tubeworld.com/kuhltube.htm#
some highlights: "By means of this unique and vital process, the stresses interior to the materials of the tube are substantially and permanently relaxed. The "Q" of the (self) resonant (electro) mechanical systems responsible for the output of (self) microphonic spuriae is thereby drastically reduced. By this important reduction, both the peak amplitude and the "ring down" time of these systems is reduced with the result that the "apparent gain" of the tube is increased - even in feedback controlled circuits - while the "dynamic noise floor" is lowered.
The sonic improvements of a over a "factory condition" NOS tube include:
tighter focus from top to bottom
more holographic 3D soundstage
more subtle inner resolution extracted from recordings
tighter bass
increased dynamic range
faster transient response
clearer vocals"