I have this phono stage. The voltage is not switchable. I did extensive tube rolling with vintage NOS tubes (Telefunken, Mullard, and Amperex; I spent a small fortune). I found that the stock tubes were better suited for it. However, I thought the included optional 12AT7 to swap with the 12AX7 was more to my liking. The bass response with the 12AT7 was tighter. Very rich and juicy sounding phono stage. Also very very quiet.
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