QTC-4 Kit for Many Mid-Sized Tubes

Price: £44.95

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QTC-4 kit, a Four Digit Nixie Clock Kit for Many medium Sized, Solder-in Tubes:

If you have, or wish to purchase from our tube selection, QTC-4 is a great value kit to make a very cool looking 4 digit Nixie Clock. Here is a small selection of compatible tubes.
IN-8-2, IN-14, IN-16, 
Z570M, Z5700M, Z573M, Z5730M, Z574M, Z5740M, GN-9A,  ZM1080, ZM1082, ZM1134, ZM1135, ZM1136, CD66, ZM1240, ZM1242, XN12, GNP-17A, ZM1210, ZM1212, CD66, ZM1240, ZM1242, XN11, XN12
If you have other tubes, please send us a message to check compatibility.
If you are using your own tubes, please add a message on your order, telling us the tube type so we can send the correct tube cell PCBs. If you are ordering tubes from our site, we will send the appropriate matching tube cell PCBs.

Case not included, but available in our store.

QTC-4 features:
Matte Black Main PCB with Gold pads
Reduced component count by using intelligent RGB LEDs - no anode resistors needed!
Simpler Anode Drivers, with socketed Optoisolator Anode Drivers, for easier assembly and troubleshooting
Double dot colon neons, with multi modes for AM / PM indication
Support for our GPS and WiFi Time Receiver Modules


Previously, a failed tube always meant a tricky operation to delicately remove the tube whilst trying to preserve all traces intact. Whilst this was certainly possible, It was never easy, and made it uncomfortable to give a Nixe Clock as a gift in case a tube ever failed. With the QTC system (‘Quick Tube Change’), each tube is soldered only to its own mini ‘tube cell’ PCB. A tube can be changed in minutes with no danger to the main PCB. The small addition in cost is dwarfed by the huge advantage this gives. A single main board is capable of driving tens of different types of solder-in Nixie Tube. You can even completely change the tube type of your clock by installing new tube cells and tubes.

Hex standoffs not included. If you buy one of our cases, all hardware is included anyway. If you are making your own case and need some standoffs, we have several sizes here.

  • Hours and  Minutes display on medium sized tubes, with typical 13 - 18mm digit heights (Not included)
  • Uses a Precision Quartz Crystal Oscillator as the timebase
  • 12 or 24 hour modes
  • Programmable leading zero blanking (USA customers prefer this format)
  • Optional GPS / WiFi  synchronisation with status indicator LED
  • Dedicated DST button to rapidly switch between DST and Standard time (summer / winter time)
  • Supercapacitor backup. Keeps time during short (Typically 2 - 4 hour) power outages
  • Simple time setting using two buttons
  • Configurable for leading zero blanking
  • Double dot colon neon lamps
  • various colon neon modes including AM / PM indication 
  • Seconds can be reset to zero to precisely the set time
  • Programmable night mode - blanked or dimmed display to save tubes or prevent sleep disturbance
  • Separate modes for colon neons during night mode
  • Standard, fading, or crossfading with scrollback display modes
  • ‘Slot Machine’ Cathode poisoning prevention routine
  • Programmable RGB tube lighting – select your favourite colour 
  • Not AC frequency dependent – works in all countries
  • All user preferences stored to non-volatile memory

Be sure to add a note on  your order for use to send the correct tube cell PCBs!
Download Kit Assembly Instructions Here


The buttons and indicator LEDs (Sync and DST) are conveniently located at the front of the clock

A matching laser-cut Plexi case is available in the cases section of our store.

Rear view of the clock, showing 12V power input, GPS socket and also a dedicated connection for our dual Dekatron Driver DekaDuo.

Time Synchronisation Options
A range Auto Synchronisation options are available: GPS, WiFi


The following electronic components are provided, including:

4 X Tube cell components for mounting the tubes
All transistors, resistors, capacitors, ICs, diodes
2 X Neon bulbs for hours:minutes:seconds separators
Double sided, plated - through - hole PCB with black solder resist
Fully pre-programmed PIC microcontroller, with socket
RGB LED Tube Lighting Pack

12V Power supply not included but available:

You will need a 500mA 12V DC Power Adapter. It is not included, but you can find the specification here, and if you don't already have one at home or office, we have them for sale.

Download Kit Assembly Instructions Here

  • Model:
  • Shipping Weight: 0.15kgs
  • 623 Units in Stock