This is a probably a fake Texas Instruments chip.
Check the logo, on the SN74141 it is usually black with only a white line contour where this s a filled white logo with round corners where they should be straigth lines. This number origins from a Hungarion ebay seller. The TI chips I have do not have this notch on the left site. The TI 74141 is very hard to find these days,the russian versions, K155ID1, are available more readily.
Last edit: 5 months 3 weeks ago by Walter John. Reason: typo mistake..
I agree - now I look at that Logo again, it really doesn't look like one I have seen before. The whole logo is rounded and poorly defined, just enough to trick a casual observer, but not someone who is paying attention.
Here's a real logo - and it doesn't look that much like the one on your chip:
Thanks guys for your updates. I do agree with you - obviously these are fake. I wonder what they actually are?
Unfortunately I got them too long ago to dispute on AliExpress, or even leave a bad review. Lesson learned -- don't order stuff in advance, or certainly without thoroughly testing it when it arrives. Fortunately this was only a few bucks, and it did no damage. The clock is working fine now with a K155ID1 and that one tube replaced.
Interestingly, the tubes I got from eBay (from Moldova) and I sent a message to the vendor about the bad one. I didn't expect much, since this order also being many months ago, but he replied immediately and was very apologetic and has sent a replacement in the mail. Nice! And makes the SNAFU frustration with the 74141's much easier to bear