The pin sockets were pretty forgiving. I don't have one handy but a copy of the RCA Receiving tube manual should h= ave that info if anything will. -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Bob Bl= ick Sent: Wednesday, March 28, 2018 10:58 AM To: Microcontroller discussion list - Public. Subject: [EE] Vacuum tube (valve) pin diameter Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such= as the 12AX7A? I'm measuring about .040" but I can't find a spec for what = it should be or what the tolerance is. Thanks! Bob -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .