If anyone let's you, "try out" any NOS tubes; you MUST have a VERY GOOD friend(in heaven)! Especially tubes as rare and expensive, as the Tung-Sol roundplates. The bottom gettered Ken-Rad VT231, is not nearly as expensive/sought after, but: still hard to find(a very natural sounding tube): (http://www.ebay.com/sch/i.html?_trksid=p2055119.m570.l1311.R7.TR7.TRC1.A0.Xken-rad+&_nkw=ken+rad+vt231&_sacat=0&_from=R40)
