It will depend on who you ask, so be prepared for opinions and reasons.  We all 
value the tubes highly and try to do whatever we think will prolong and extend 
their lives.  Keep some spares for a rainy day…

 

I would have no problem moving them around (that’s my comfort level) but the 
cathode poisoning prevention routines are supposed to help prolong the usable 
life of the tubes.  Even within a single tube, you might normally observe small 
variations.  You only run the risk of damaging the pin seals to the tubes by 
physically moving them around.  Careful handling and straight pins will reduce 
the risk.

 

One widely used practice for tubes that are used, is to place any tubes that 
have weak digits (other than 1 and 0) in the tens of hours position because 
that position uses the least of the digits on a regular basis.  The tens of 
minutes and the tens of seconds are the next “hiding place” for tubes that have 
weak upper digits.  Only the seconds and minutes positions are evenly used in 
the conventional six digit clock.

 

I have one nixie clock that ran for over 35 years without a tube failure 
(CK8754 tubes).  I think that the overall brightness was slightly lower after 
all of those years but they faded together.  The tubes were never rotated and 
in fact, the pins were soldered to wires in the perf board  with point-to-point 
wiring.  They were direct drive at rated current.  While these tubes were not 
IN-18, I think that nixies, if driven within spec using modern designs and 
cathode poisoning prevention, can expect a decent life.  The Spectrum clocks 
have cathode poisoning prevention and currently feature a PIR motion sensor 
that will extend the life of the tubes when no one is around.  I think that 
using the PIR feature will have more of an overall life extending effect than 
moving the tubes around.

 

Jeff

 

 

 

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Forfanatic Tsai
Sent: Friday, June 03, 2016 1:08 AM
To: neonixie-l
Subject: [neonixie-l] Relocate tubes on single clock

 

Hi, sorry this might sound like a noob question.....

 

Will you relocate tubes on a clock? like switch second tubes with hour tubes 
for balancing life time. Or just left them there until they fails?

 

I own one Spectrum 18 from PV electronics now and IN-18 price is flying high 
now :( (sure I won't care this if it's a set of cheap IN-12s lol)

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