The Claus-Dieter Urbach kit ( also a multiplexed kit) http://www.nixieclocks.de/english/ involves a little bit of work if you want to add colon separators and an AM/PM indicator. I had to add a daughterboard to accommodate the additional components (not included). Also, to add the ability to automatically turn off the tubes during sleep hours, you must add a dip switch or shorting strips across P.I.C. pins. This is a very basic kit with not a lot of bells and whistles and is aimed at the hobbyist who likes to tinker ( kinda like me). It does have a nice dim feature that allows you to select 4 different brightness levels, but that’s pretty much it! I must say that Claus does support his product very well and was very responsive to any and all questions. As far as I can tell, this kit is pretty much the only thing out there that accommodates the Z566M tube. There is one available here http://www.mapsevoli.com/ but this clock is WAY too expensive for what you get. I finally took matters into my own hands for the next clock and borrowed from 2 different kits. I modified the Urbach Z566M tube board and grafted in onto the TubeHobby electronics to create a superior product with a great feature set. (See my ArtDeco clock) The Black Walnut clock did come out pretty nice though, even if it is lacking from a feature perspective. The Z566M tube is truly a thing of beauty! Unfortunately, they are as expensive now as the IN-18’s.
Tubes purchased from Jan Wuesten http://www.die-wuestens.de/eindex.htm in Germany.
