fix category and tags of z550m

content/other/Valvo-Z550M/index.md

@@ -2,7 +2,10 @@
 date: 2024-12-02
 title: Valvo Z550M
 categories:
+    - Other
+tags:
     - Valvo
+    - side-view
 ---
 
 When the Nixie tube was introduced in the 1950s, it faced a significant drawback: its driving circuitry required transistors with relatively high breakdown voltages capable of handling the elevated operating voltages. At the time, such transistors were not widely available. This limitation created a demand for an alternative display technology that could operate with low-voltage, low-current logic circuitry. The solution was the Pixie tube, initially designated as the Z550M and later renamed the ZM1050.