Hard to generalize. Gold pins are presumed better due to their corrosion resistance. Diamond stamp is AFAIK, refers to the mark molded into the bottom of Telefunken tubes. Not sure how it applies to Tesla tubes. Also be aware that many of the older tube brands have been sold, with the buyer getting the ability to use the name, but are using factories in other places, primarily Russia.
Tesla Tubes
I am new to tubes. Are Tesla tubes any good, Or does it depend on the tube? Are older tubes better than the newer ones? What does the term "Golden pins" stand for? And Diamond stamp? Thanks a Million!