[stevehertz]

It's all very well this talk about how valves change from the day are they made through the period in which they are used/listened to. I, and thousands of others get that, we know that! The point is, can it be HEARD?!

Like David (aka Radio Wrangler) says:

In the high end audio world, there are several principles which are not allowed to be challenged:

There is no limit to the discrimination of the hearing of a true audiophile.
No factor is so small that it can be dismissed from consideration.

Quite simply, we're participating in another audiophoolery thread. ABX testing, that'll provide REAL answers!