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HP 9100A/B Transistors


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Post: #3
11-05-2011, 11:12 AM
Richard Wilder Offline
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Anyone know the significance of the colored paint dabs on many of the transistors in these calculators? Maybe they were hand selected for parameters to work in the particular circuit(?)

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Post: #4
11-11-2011, 09:08 AM
Joel Setton (France) Offline
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Richard,


The HP Journal article on the 9100 mentioned that the transistors were burned-in, to detect early failures and improve reliability. As far as I know, this is not related to select a particular parameter.


I hope this helps!


Joel

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