That will be difficult, because of lack on the (expensive) equipment.. I have here a Sylvania 6909 and a 6910 as well the Raytheon equivalents. Also two Sylvania 7155's. Should be fine if I could test them. Tha tubes are for the collection, except the 7155's. They are bought to make a clock divider. eric
_____ From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On Behalf Of Nick Sent: vrijdag 21 juni 2013 12:55 To: neonixie-l@googlegroups.com Subject: Re: [neonixie-l] Re: Dekatron frequency counter and 6909 issue On Friday, 21 June 2013 11:35:13 UTC+1, Tidak Ada wrote: Isn't it just the loss of hydrogen (helium) that makes the trouble? The absolute pressure inside the tube is lower then outside, but the partial tension of the hydrogen (helium) is higher than atmospheric as me is told.... Whilst many fast dekatrons contain hydrogen (and some helium) I'm not sure the 6909 does - its glow is very orange, indicating a standard-ish Penning mixture with no hydrogen - also, I can find no documentation stating that this tube contains hydrogen - it is, however, a reasonable assumption that it *might* as its a "higher speed" (for a dekatron) tube... Hydrogen gives a pink-ish glow... not orange. The only real way to be sure would be to find a good 6909 and do a spectral analysis of its glow... I'm sure we have members who could do that... I'm still interested in the relative performance of extant Sylvania vs Rattheon tubes... Nick -- 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/d8bd589a-62a7-46c5-a249-7755b6b 04864%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!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAMbniH%2B%2B6ddOh2850e7%2BQzMBAAAAAA%3D%3D%40zeelandnet.nl. For more options, visit https://groups.google.com/groups/opt_out.
