From The Auction
This is a NIXIE tube display from an old
HP counter. It uses vacuum tubes for the counting logic.
There are 3 type 47 lamps that shine from back to front through some kind of light tube.
These tubes create decimal points. They might be relocated to form a colon.
A orange tinted bezel is also included.
With a little work and some imagination you
Could build a nixie clock entirely from vacuum tube
It has 7 nixie tubes for the display, and 28 each of
the 5963 dual triode (similar to 12AU7) tubes for the counters.
I took a 5963 from each counter and tested on a tube tester.
They tested from 3200-3400mmho.
The book says that 3200 is average, so the tubes test good.
I have no way to test the nixie tubes.