One of the largest and rarest Chinese Nixie tube

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Zac Huang

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1:54 PM (10 hours ago) 1:54 PM
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Although it belongs to the same series as SZ-2 and SZ-3, but it is much rarer than them. As far as I know, it is used in smelters and can display the six oxides produced during the smelting process, including: CaO, SiO, MnO, MgO, FeO, and PO. 
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Zac Huang

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2:17 PM (10 hours ago) 2:17 PM
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Tube diameter 50mm, character height 33mm. I know the largest Nixie tube displaying single and double-letters is the GR-1620. Perhaps the SZ-4 is the largest three-letters tube? If there are other larger three-letter tubes, please show me.
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Zac Huang

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2:20 PM (9 hours ago) 2:20 PM
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light up pictures. 
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Zac Huang

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2:22 PM (9 hours ago) 2:22 PM
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Nicholas Stock

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2:31 PM (9 hours ago) 2:31 PM
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That is spectacular. Very nice tube and very unusual. Thanks for sharing!

On Fri, Jun 12, 2026 at 11:22 AM Zac Huang <qede...@gmail.com> wrote:
99816b8021a6c0adfaf18c4b7d4a0e9339228390.jpg29b57457cdd257a0128b866f80f9b20e39228390.jpg7a2f69c4a92ced51332b9e94045728b039228390.jpg

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bogdan paduraru

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3:35 PM (8 hours ago) 3:35 PM
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Beautiful tube ! Congratulations 

On 12 Jun 2026, at 21:31, Nicholas Stock <nick...@gmail.com> wrote:


That is spectacular. Very nice tube and very unusual. Thanks for sharing!

On Fri, Jun 12, 2026 at 11:22 AM Zac Huang <qede...@gmail.com> wrote:
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<29b57457cdd257a0128b866f80f9b20e39228390.jpg>
<7a2f69c4a92ced51332b9e94045728b039228390.jpg>

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