NixieClocks.ch uses IN-18 tubes. The IN-18 tube is the largest tube manufactured by Gazotron, the king tube, so to speak. It is significantly larger than the IN-14 tube.
The stocks available today are small and the tubes are difficult to obtain. Accordingly, the prices are high.
IN-18 tubes can display the digits 0...9. The figure height is 18 mm. The height of the digits is an impressive 40 mm. Due to the large dimensions, the digits are very easy to read.
The melted solid pins are intended to be plugged in directly.
Nixieclocks.ch installs right now unused tubes.
At the back of these tubes "ИН-18", "02", a "circle with dot", "84" and symbol "pentagonal shield" symbol are printed. Some series do not contain all information. However, the imprint is not always well preserved due to the age of the tubes. These tubes have excellent prints.
IN-18 (ИН-18) type designation of this tubes.
The shown tubes were made in February 1984.
The logo of the manufacturer Gazotron in Rovno (now Rivne) in Ukraine. A dot pictured in the center of a circle.
There is virtually no information available on Gazatron today.