Well Bob, the problem is, that the pinout is understood wrong in 99.9% for both, IN-18 and IN-4. All PCB designs for the IN-18 I have seen from other people are WRONG! Example: IN-18: All tell, me included, that pin 4 is pointing to the front. see my page here: http://www.tube-tester.com/sites/nixie/data/in18.htm I know: it is wrong! I do tell that on my page as well to avoid "dumb" questions. But what is right? Which pin is in front? The answer is easy: NO pin is in front! Right is, that pin 4 must be in one line with pin 11 and pin 1 must be in one line with pin 14. (same at the IN-4!) See the picture here: http://www.tube-tester.com/sites/nixie/nixie-clocks/IN-18-BD/pic/IN-18-BD-inside.jpg Can you see it? Pin 4 is not pointing to front - only nearly! That's why in all IN-18 clock I have seen the digits (cathodes) stand inclinded to the longitudinal axis of the clock. Now immediately go to your IN-18 clock and check it! Do the cathodes stand even? Then the designer did get it right! ;-) Dieter
----- Original Message ----- From: coggs To: [email protected] Sent: Sunday, May 06, 2012 5:54 PM Subject: [neonixie-l] IN-4 Variations I'm laying out a board for IN-4s. Thanks to Dieter, I had great info to go by, but I noticed a small discrepancy. In both the tubes I have and his photos, the vertical axis of the digits is actually slightly off. This is due to the pin being welded to the side of the interior support (see photo). Has anyone who has seen allot of IN-4s know if this is pretty much the norm ? TIA ..c www.cogwheelcircuitworks.com -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
