Again, the specs on the Pass Labs website to which I linked are 20K ohms unbalanced for the XA-30.5, and was corroborated by John Atkinson when he tested the amp.
says 15kohm, and also my recollection in discussion with them. The XA60.5 manual says the same thing. But, either way, I still think it will work fine with most tube preamps with under 1000 ohm output impedance.
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