The two finished nixie clocks.

[Leroy Jones]

Older larger clock made in 1994-1995.

Newer smaller clock made in 2010.

Big clock uses NL-807 and 803 tubes.

Smaller clock uses NL-6844A tubes.

https://youtu.be/gJ84ItTar-g

[Leroy Jones]

https://youtu.be/g_2FTYY2Txg        Here is one more of my currently running nixie clocks.  It is the 8422 clock.

It's in the switchroom, with the step-by-step telephone exchange.

[gregebert]

The first 2 clocks remind me of the guts of vintage equipment.

Regarding the telco switching cans,  please tell me you're working on a clock that uses those for counting......

[Leroy Jones]

Yep.   Thanks!  Both of those enclosures involved a lot of preliminary design and layout work before making any parts.

The smaller clock was a real tight squeeze getting it all in there and one huge benefit of having it in there is that it holds a steady

temperature inside the box at around 115 degrees F.   It unknowingly ended up making the perfect crystal oven and it tends to hold the

TCXO very steady because of the temperature stability.   That is a free-running clock and it holds within 5 seconds per year total error.