YES! You are very right. That certainly is RUST, not a good thing. Not only that, but it looks like somebody made an effort to remove it from the 8091. Of all the old 7971's I have, not a one has advanced rust like that up near the envelope. Some poor bastard may be in for a rude awakening! Poor may be the wrong word!
On Saturday, March 30, 2013 7:23:35 AM UTC-7, AlexTsekenis wrote: > > I am not aware of the history, usage or storage conditions of these tubes, > but picture two makes me worry. > If you look in picture two the leads show signs of iron oxides, rust. > Dekatron picked up on this. > As you know Dumet glass-to-metal seals have an iron-based core, surrounded > by copper. It seems the outer copper has been stripped off (many > insertions?, bad storage?). With the copper removed the rust propagates up > into the tube and usually causes a leak. Many nixie tubes, even new ones > experience that; they look fine but they don't work. I mean, have a look at > Jens Boos page (linked in the auction) to see how good pins look like. > > The poster of the auction knows about NOS, knows what the original package > is and that they are rare. > > That combined with the 'as is' and 'not returnable' settings of the > auction are suspicious and make me very worried. > > Regards, > Alex > > On Thursday, March 28, 2013 12:39:01 PM UTC, Dekatron42 wrote: >> >> Found this auction just now: >> http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=151019081604&fromMakeTrack=true&ssPageName=VIP:watchlink:top:de >> >> The pins look a Little rusty though..... >> >> I have no Connection with the seller and so on..... >> >> /Martin >> > -- 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/-/NkzVcmnd2M0J. For more options, visit https://groups.google.com/groups/opt_out.
