Could this be one reason tubes (and perhaps records) sound better?

Personally I would not recommend intentionally generate white noise in your listening environment.  There is a difference between what happens in the laboratory environment and your own.  Just because they said so, does not mean it's true.

... which is why experiments are recreated, for validity. I am struggling to see any merit in your advice to someone who wants to experiment.

Lose the vinyl and the CDs and listen to reel to reel tape. It’s all you need.

... which is why experiments are recreated, for validity. I am struggling to see any merit in your advice to someone who wants to experiment.

Go ahead Mr. 24/7 lols.

The Nelson Pass article where he describes his little harmonics generator goes a long way to providing a clue to the clue deprived. I'm glad Nelson is around as sort of an "anti Ted." Also, well said jnorris2005, as I utterly agree.