The Museum of HP Calculators
HP Forum Archive 20
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|HP 9100A/B Transistors|
Message #1 Posted by Richard Wilder on 5 Nov 2011, 11:12 a.m.
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(?)
|Re: HP 9100A/B Transistors|
Message #2 Posted by Joel Setton (France) on 11 Nov 2011, 9:08 a.m.,
in response to message #1 by Richard Wilder
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!
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