Max pain, you cannot upgrade a Pass Labs X generation amp to a X.5 series. The .5 series is a significant change from the X series for the better. Read my reviews both on the 350.5 and XA-100's for more details regading the sonics of these wonderful amps. I believe a 350.5 would be a great match for your Thiel's and your ML 38S would work just fine with the Pass, sometimes you have to be careful with tube preamps with Pass power amps, but this mute in your situation.
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