Serenity:

Thanks for 'prodding' the testers over at HTS to try to come up with something definitive!

In the end, it seems that there are such minute differences in the way that amps sound that it is hardly worth the huge effort it takes to undertake such an exercise. Even then, they often weren't really sure of what they heard or perceived to have heard.

The pragmatic side of me makes me look elsewhere for differences & so far with me it is only with speakers...

TAM