Originally Posted by
repechage
In reading the various frame builder forums, it has to be really bad. Depending on how the tubes were obtained, domestic distributor or imported, the path of least resistance is to select a better one.
Due to the mfg. process, I actually would not expect perfection.
I have never seen a tube mfg. spec as to what THEY tolerate, probably proprietary.
i know every industry is different but, if I built a guitar with the smallest flaw, it would be all over the Internet before I could defend myself with a reasonable explanation. Cosmetic, or otherwise.