Ed, the pads on the Spectrum PCB for the colons already have a series resistor 
on board for the neon tubes.  The clock addresses each of the neons 
individually. 
Jeff
-------- Original message --------From: Edward Van Belkom 
<[email protected]> Date: 10/4/17  7:24 AM  (GMT-06:00) To: neonixie-l 
<[email protected]> Subject: [neonixie-l] Re: PV Electronics R568 
Clock Project With Black R|Z568M Nixie Tubes 

Well great news.
Dalibor is shipping my tubes today! 
I am getting close to having the clock base done and ready for sanding and 
anodizing. I have a sample at the anodizer now to see what grit sandpaper I 
need to sand the aluminum. The hard coat will fill in some so I need to see 
that it matched the brushed brass properly.
I have the PV board set up at 180VDC with the 8.2K resistor for Dalibor's tubes.
What value resistor would be best for the 4mm wire end neon bulbs Pete supplied 
with the kit at this voltage?
Thanks everyone for helping me out on this.
 




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