PASS XA160.5 VS x600.5

[jpspock]

Dear all Pass AA. I had the chance to listen a lot of time the X600.5, and it was always fabulous. I went to the XA100.5 for many reasons, smaller (problem of place), lower price, and it sounds more tube. Now, with the time I would be interested to go a step forward. But the question is : X600.5 or XA160.5? I never had the possibility, the chance to listen the XA160.5 and most of you are using the Xa160.5, and I would like to know if some of you have compared both amplifier?

If it is the case, how you could describe the differences.

Many thanks for your help,

jp