A lot has to do in the wording/meaning of NOS. Some newbies, or some which are playing dumb to rip people off, don't understand that NOS, means NEW old stock, ie, BRAND NEW, like found them in a military wherehouse, in storage.
Do used Vintage tubes test like a new tube? Often yes, but for the prices some people sell/get for their tubes, especially here, they should be virginally new.
Do used Vintage tubes test like a new tube? Often yes, but for the prices some people sell/get for their tubes, especially here, they should be virginally new.