Tyler,
The board markings are incongruous.
The resistors in one photo are marked R1 through R6. but the character
"R" is not in the Cyrillic alphabet.
There is also a "V1" designation, which is not a Cyrillic character,
either. Voltage would have been designated with a "B" character.
The markings on the ICs are consistent with Cyrillic characters, and the
IC designs look typical for Russian chips of the era.
It's interesting that there are date codes ranging from '73 to '80, but
I don't see any obvious signs of rework on the PCB.
Anything else in Russian you need help with?
Dave
On 5/23/2019 12:15 PM, Tyler Bourne wrote:
The clock has arrived! It's Huge!
It seems like the clock was in the process of being stripped for parts
when it was saved. The tens of hours board was covered in nasty flux,
probably the plumbing kind. I've cleaned it up and put it back in.
I've created a schematic for the display board and will start working
on a replacement. While the display boards are all the same the
control boards attached to the back of them are all different
depending on which digits are needed. I can tell this is a 12 hour
clock since the tens of hours digit can't form a 2, interestingly most
for the tubes on that board have never been used.
Since the display boards and the controller boards are separate I can
replicate the display board the way it is. I will create a
replacement control board for my clock and will also create a more
modern control board for use with the spare display boards I will have.
The IN-28 is an odd nixie, it runs at a higher voltage and has a
control grid. All the groups of control grids are connected to the HV
supply through a 3.9M resistor and to the chips through a 1M
resistor. I'll have to figure out what all these chips are and find a
modern equivalent.
If any Russian speaking members of the group can help identifying the
chips I would be super grateful.
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