Strange

I have a modular rev3 with in-14 tubes when I updated the clock would not work with the 74141 chip that I always use but works with the Russian equivalent as the clock is working no panic but would love to know why thanks

Maybe ESD got your 74141. Just a guess.
Jim

Sorry should have said tried two different 74141 chips unless I managed to kill two chips

Sorry. It was just a wild guess. I really don't know the electrical differences between a 74141 and a K155ID1. I would think that a 74141 should work in the circuit.

Jim

Yes that is exactly what happened all I can think of is when the clock stopped working I changed the chip for one from a new batch I can't have so much bad luck that I killed a chip and the new ones are dud