Hi, The tubes do normally have dark deposits, though usually located in one place where it was evacuated of oxidizing gasses by igniting some combustible material (i believe). Either way, they are never test tube clean. This darkness is usually on the back though, not obstructing the viewing side. To be honest though, if they were used one would not expect the leads to be full length. They do poison up and a quick blast with some current will usually clean them up. IN-9 tubes are quite fickle and tend to misbehave quite a lot. My post a month or two ago about using ripply DC does help a lot with them jumping about. Have you got a Potentiometer you can use straight in line with a fixed resistor and your DC supply to vary the current around? Excellent for testing the linearity and looking for iffy spots?
Good luck on your spectrum analyser project, I hope to do the same soon too. - Alex On Tuesday, 12 March 2013 14:33:45 UTC, rkvs wrote: > > Hello experts, > I recently bought a set of IN-9 tubes for a diy audio spectrum analyzer. > > Here are links to the pictures of one of the tube: > http://www.flickr.com/photos/svkr2k/8550925083/in/photostream > http://www.flickr.com/photos/svkr2k/8550925431/in/photostream/ > http://www.flickr.com/photos/svkr2k/8550925643/in/photostream/ > > Is this really new one? I noticed that the backside of the tube has black > deposits like it was used? > Any ideas? > > I'm totally new to nixie tubes. > -rkvs. > -- 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 [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/965xlPRjng4J. For more options, visit https://groups.google.com/groups/opt_out.
