For the usual steering of dekatrons are special cold cathode triggers developed, but they are so rare that it will take decades to get them in suitable quantities. However there are other cold cathode triggers that are useful. Disadvantage is that all these tubes have difficulties to trigger in the dark. Therefore they are doped with a small amount of a radioactive element to make triggering more reliable. That doping has a certain half life, depending on the isotope used. Radium last longest, but is also an alpha radiator, that makes it dangerous. The half life of CO60 (most common) is too short to find any reliable working tube at this moment. May be the use of short wave UV-LED's is a solution. A supplier is Roithner Laser in Vienna. I will try to do some experiments in the future. The use of small thermionic thyratrons may be possible, but keep in mind the power consumption of, fro example, a small 2D21 is already for the heater alone 4W !! Here [ http://www.sgitheach.org.uk/index.html ]a sit of a member with much experience with trigger tube tube clocks. He uses these clocks only as demo to avoid a to high bill from the electricity supplier... An other tube clock with only thermionic tubes you can find here; [ http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Clock/ Digital-Roehrenuhr.htm ] eric
_____ From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On Behalf Of Dekatron42 Sent: woensdag 2 oktober 2013 8:32 To: neonixie-l@googlegroups.com Subject: [neonixie-l] Re: Dekatrons with thyratrons The Russians regularely used thyratrons, both cold cathode types and those with a heater to drive Dekatrons. What types do you have? /Martin On Wednesday, 2 October 2013 07:29:49 UTC+2, Smiffy wrote: Has anyone done/seen Dekatrons used in conjunction with thyratrons? I just happen to have some thyratrons which I bought as spares for a Russian Geiger counter I was repairing (fault was actually a gas voltage regulator tube.) They were actually being sold as decimal indicators for Nixie clocks, believe it or not! Didn't know if they might be used in some way between Dekatron stages, or anything like that. Sorry to bring H into an Ne forum ;-) -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d549047e-da4c-49b4-8ad2-509d2bd 4f217%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAADDQkNcrPQFFhxPF6Q%2BfypgBAAAAAA%3D%3D%40zeelandnet.nl. For more options, visit https://groups.google.com/groups/opt_out.
