Try disconnecting pin16 of the K155 ("0'"); if that solves the unwanted
zeros you're 1 step closer. If this IC is bad, it might be worth removing
it and installing a socket. That way, you can test each tube by grounding
the appropriate cathode pin at the socket.
My experience with IC's and other semiconductors is that they are extremely
reliable as long as the datasheet parameters are followed. I dont recall
ever having a confirmed IC failure, except for a used Raspberry Pi I
apparently killed from ESD (or maybe the previous owner weakened it ???)
On Monday, June 10, 2024 at 2:57:32 PM UTC-7 Mac Doktor wrote:
> This just arrived today:
>
> https://www.ebay.com/itm/387042686464
>
>
> It's multiplexed. The zeroes are on all the time and several numerals
> never light up. I assume that the K155ID1is toast. Anyone?
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> https://www.astarcloseup.com
>
> Detective Gregory: “Is there any other point to which you would wish to
> draw my attention?”
> Sherlock Holmes: “To the curious incident of the dog in the night-time.”
> Gregory: “The dog did nothing in the night-time.”
> Holmes: “That was the curious incident.” — "Silver Blaze", Sir Arthur
> Conan-Doyle
>
>
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