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Hello, according to some people you must change 12ax7 tubes every two or three times you change the power tubes. I read on a site that their life span cannot be determined and could be almost infinite so that they could be changed only when you want to change the tone of the (pre)amplifier...

Is it possible to divide 110v to 220v classifieds? I live in Europe and it’s difficult to understand where the item is sold or if it works with 220 main voltage Thanx