[neonixie-l] Re: 4 digit nimo clock so far

[gregebert]

Thanks! That's basically how I have it oriented on the PCB layout. I drew 
an imaginary line through pins 5 and 11, and made that vertical. This is 
offset slightly from the diameter of the tube, and it puts the anode nib at 
the 12-o-clock position. Not quite where @westdave has his tube oriented, 
but I think it's close enough to fab the driver board. I'm hoping that 
whatever misalignment I have is within the tube-to-tube variations. If 
worst comes to worst, I could swap tubes around or respin the board.

Funny thing is, I've spent more effort and angst orienting the NIMO socket 
than I have for nixies on other PCBs, and all of those turned out fine.

94 nets to go on the mainboard routing...and no, I never use an autorouter.

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[neonixie-l] Re: 4 digit nimo clock so far

[threeneurons]

On Monday, April 23, 2018 at 10:34:29 AM UTC-7, gregebert wrote:
 

> ... I'm unsure about the orientation of the display vs the tube pins.
>
>
Go to page 4 of the following document:

 https://threeneurons.files.wordpress.com/2015/05/iee_nimo808.pdf 


The anode "nib", is 18 degrees off of pin 12, making pin 11 roughly 9.7 
degrees off of dead top center. The "Compactron" base has 27.7 degree 
spacing between pins, according to all documents that I could find.

>From the tubes I have, the "nib" is top dead center. See the following 
photo:



Look at the internal structure. The nib seems centered within it. But the 
digits seem offset laterally:



 


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