Resurrected NixiSat GPS clock...

[Nick]

In the 1970s I bought a nixie tube counter...

The chips on that are old Siemens, Valvo and Mullard (later Philips) TTL part numbers - there are direct 74xx-series equivalents... (tables are available online) e.g.

• SN74141 = FLL101
  
• SN7441 = FJL101
  
• SN74142 = FLL151
  
• SN7490 = FJJ141 (Valvo) or FLJ161 or FLJ165 (Siemens)
  
• etc.
  

Unfortunately, they were made in the 1970s and had a date code on them too, so anything made in 1974 would be marked "74xx" where "xx" was the week number.

To add to the confusion, sometimes that *real* SN74xx-series code was also added...

Ho, hum... Deja Vu - we had this discussion in April last year: http://golbornevintageradio.co.uk/forum/...3#pid32733