Soviet digital clock analysis and restoration

Repairing and examining a soviet digital alarm clock Elektronika (Электроника) 6.15 from 1982 with a vacuum fluorescent display (VFD) IVL1-7/5 (ИВЛ1-7/5). The schematic and how does it work. Old version with K176IE12 (К176ИЕ12), K176IE13 (К176ИЕ13), K176ID2 (К176ИД2) and two K161KN1 (К161КН1) chips. Comparing it to the newer version with K176IE18 (К176ИЕ18), K176IE13 (К176ИЕ13) and K176ID3 (К176ИД3). Attempted VFD display regeneration. Possible modification for nixie tubes using K561TM3 (К561ТМ3) and K155ID1 (К155ИД1) chips instead of K176ID3. Correction: K561TM3 contains 4 latches, not 6.

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