I don't believe there's anything larger than the MASSIVE Rodan
CD-47 Nixie Tubes from Okaya Electric Co. Japan.
The tubes themselves stand over eight inches tall, with digits
approximately 6 inches tall. They'll light a room nicely.
The NixZilla clock is based entirely on the GPSII clock
electronics package. The GPSII HV power supply was modified
to deliver a whopping 150 ma at 180vdc using a SEPIC circuit. That is a
lot of juice. Those CD-47's consume 25ma per tube.
The six tubes are arranged parallel on a section of extrusion
stock,with the clock electronics hidden inside. Colon posts are clear
In all, three clocks were assembled. Two were presented as gifts. My
personal clock has been running on a shelf in my office ever since.
I will be taking some images of the clock shortly. The only
image onfile is the original prototype spread across a desk back in
And for you tossers: the name "NixZilla" has been in use since
2002 to describe this giant clock.
Recently, I've seen no less than three individuals using NixZilla to
describe their homebew clock.
These Rodan CD47 / GR-414 tubes are extremely scarce, and highly
sought after by collectors.
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