[time-nuts] HP5370A vs B version

[Mark Sims]

Once upon a time, I looked into the front ends of the 5370 counters (mostly 
5370A) and found that it was practical to build a replacement using modern 
chips.   I then lost interest in the project  when I found an Ebay seller with 
a lot of 10 pieces of the 5370A chip for dirt cheap (sorry, all are now gone).
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