kota1,
I have never needed to change the power tubes in the several years of use. They barely glow so very little strain on them. The claim is they will last 10+ years. Probably will.
Anyway, back to the Sorcer X4 thread. All I can add is that until the naysayers actually try it, then perhaps they can describe the technical or power effects of the product.
Erik, where is your creative motivation?
ozzy