They have the appearance to me of being 'formed' out of square wire,
around an appropriate form, and spot welded where necessary!
Irv.
On 2/11/2025 11:56 AM, 'Oskar' via neonixie-l wrote:
This tube is currently on loan to me and appears to be from the Soviet
Union, possibly an IN-18 prototype. However, I honestly don’t have
much information on it. It seems to be filled with pure neon and had
significant cathode poisoning, particularly on the zero. I spent a few
hours healing it today, and the results turned out great. It now runs
flawlessly at 170V with a 4.7k resistor again.
The digits are very intriguing. They don't appear to be etched/stamped
as parts of them overlap (e.g., crossing in the four) but they aren't
bent from round wire either.
1-min.JPG2-min.JPG3-min.JPG4-min.JPG5-min.JPG6-min.JPG7-min.JPG
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