OK, let me reiterate. My feeling, to answer Mr. Bill Wojo et all, is ALL tube testers stress the tubes in their testing.

If, someone has a really good system, they can take a NOS tube, say a high mu tube ( mu of 100, eg 12AX7 ) used at the input of a two stage amp ( in my case ) , or input of a two stage phono preamp.......and listen to the tube without testing, and after testing, and, IF ( a big word) the system is transparent and resolving, you will hear a degrade.

Its really that simple. The question, and only reservation I have is : is your system transparent and resolving ????

I am sure, if some will test this on a reference-quality system, they will hear it. We all hear it about the same, IF the system is decent.

Cheers, have fun.


Jeff Medwin......Low Ohms.