Are Black Sable tubes snakeoil? does it make a difference?

[vibratoking]

I'm still suspicious of the claims for cryo tubes.

Probably a good idea. Whether it does anything useful for any musical purpose is very questionable. We conducted a double blind test with Strat bridges. No one in the room could tell the difference. Tubes sound like a very bad idea given the glass envelope and the vacuum.

The cost is very high for little or no return.

[kgreene]

Frankly, I would be concerned about the effect of "cryo" treatment on the cold-intolerant parts of a tube, including the "vacuum", which we all know is not perfect. Treating the metal ahead of time might change the properties, but that is still an open question.