Nixie driver chip question

[TChesek@Epix.Net]

I have three Heathkit frequency counters, IB-1100, IB-1101 & IB-1103 plus the SB-650 Digital Display used with my HW-100 and they all use 7441B driver chips for the Nixie tubes. The 7441B's are scarce or almost non-existent and since they can be a high failure item I placed an order for the Russian  K155ID1 which is supposed to be a full equivalent to the 74141 chip which I thought to be a replacement to the 7441B. I came across a website listing truth tables for the 7441, 7441A, 7441B, 74141 chips and there are differences. Is there anyone who has used a substitution for the 7441B or knows if the differences in these chips have any impact on these counters?

73 & tnx,
Tom K3TVC

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