IV-13 Numitron Tube Clock very unique and beautiful (Not Nixie Tube but Orange also :-)


Out of stock



Designed around six Russian IV-13 Numitrons (very rare right now, and difficult to find) which in our opinion, are the finest numerical tubes ever produced in the 80’s. There is a good reason why the IV-13 is called the Queen of the Numitrons. With its extra large 22mm high digits and a warm orange glow (on a lovely pink background), it is very pleasing to look at and can be seen from a fair distance.

Coupled with modern control circuitry, you get this very unique tube clock, the first of its kind using 6 x IV-13 Numitrons.
Numitrons are rare tubes and not easy to find. They last very long, longer than nixies. It explains the high price due to numitrons.



A Numitron utilizes eight filaments for the display, seven for the segments, and one for the decimal point, all of which are enclosed in a typical tube glass body. In effect, a Numitron can be seen as an eight-way incandescent globe.

The big advantage of using a Numitron as compared to the more popular Nixie tube is that the Numitron only requires very low control voltages of 5VDC as opposed to about 170VDC for the typical Nixie tube or around 5 VAC and more than 20 VDC for the well known green / bluish VFD displays. Because of these lower voltages a Numitron, such as the smaller IV-9, can be directly driven from the control counter circuits. However using the large IV-13 Numitron requires a more complex and powerful driver circuit as each of the eight segments of the IV-13 draws about 32mA of current!


Hours, Minutes and Seconds display without Multiplex
Selectable 12 or 24 hour display modes
Uses a Quartz Crystal Oscillator as timebase with software adjustable accuracy
Programmable leading zero blanking
Date display in either DD.MM.YY or MM.DD.YY or YY.MM.DD format
Programmable date display each minute or selectable with a single button push
Alarm with programmable snooze period

Dedicated DST button for easy switching between DST and standard time
Super Capacitor backup keeps time during power outages for more than 6 hours.
Simple time setting using two buttons
Column settings (Flashing AM/PM indication, illuminated AM/PM indication, always flashing, always on / always off)
Seconds can be reset to zero to precisely set the time
Programmable night mode – half brightness or blanked display to save tubes life or prevent sleep disturbance
Weekday aware „Master Blank“ function to turn off all displays on weekends or working hours
Separate modes for column LEDs during night mode

Standard or fading display modes as an eye-catcher
Standard date display of shift in / out effect with scrolling digits
Tubes lighting with RGB autochange
LED brightness adjustable for every hour
Programmable temperature display in °C or °F at seconds 30…35
All user preferences stored in non-volatile memory

Tube sockets for easy replacement (Numitrons are VERY long lasting, but it is made of glass..)
Constant current drive for drastically extended lifespan (more than 50,000 hrs)
Selectable filament pre heating for faster reaction time of the segments
7 VDC desktop power supply is included


Complete Clock incl. IV-13 Numitrons tubes,
Power supply EU or US,
Operating manual.



There are no reviews yet.

Be the first to review “IV-13 Numitron Tube Clock very unique and beautiful (Not Nixie Tube but Orange also :-)”

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.