One of the largest and rarest Chinese Nixie tube

[Zac Huang]

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. 

[Zac Huang]

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.

[Zac Huang]

light up pictures. 

[Zac Huang]

[Nicholas Stock]

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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[bogdan paduraru]

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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