Hi If you look at the original 105, it is a *very* different beast than the “final” version. They look similar (but not identical) from the outside. The insides changed multiple times over the years.
Bob > On Jan 18, 2022, at 9:41 AM, Louis Taber <[email protected]> wrote: > > Thanks for the HP history lesson! > > I find it all pretty impressive. I guess I have always thought great > things about the instrumentation side of HP anyway. Their engineering has > always been great. But, maintaining not only parts inventory, production > capability for any product that has lasted over decades in the fast moving > world of electronics is amazing to me. > > I do wonder how much the product changed internally. It has been a long > time since anyone has used as much point-to-point wiring as was common with > tube circuitry. > > On Mon, Jan 17, 2022 at 8:31 AM Tom Van Baak <[email protected]> wrote: > >> Louis, >> >> Keep an eye on the 5071A. It was introduced in 1992; now 30 years old, >> still in full production, showing no signs of being retired. Same >> product number, same instrument, same parts, same manual. It also >> survived corporate name changes: hp -> Agilent -> Symmetricom -> >> Microsemi -> Microchip. So give it a few more years and it will beat >> your 33 year hp 105B number. >> >> It's maybe cheating to allow all the variations in the evolution of the >> original 200A audio oscillator, as Magnus mentions. In that case you may >> also allow the evolution of the original 5060A cesium standard: hp 5060A >> -> 5061A -> 5061B -> 5071A. The 5060 came out in 1964, so that's 58 >> years, and counting. >> >> If you're playing product history games also look at the hp 100 -> 101 >> -> 103 -> 104 -> 106 -> 107 -> 105 quartz oscillators. That covers 1943 >> (100A) to 2000 (105B), also 58 years. >> >> /tvb >> >> >> On 1/16/2022 1:18 PM, Louis Taber wrote: >>> The HP 105B is in the HP catalogs for a 33 year period, 1968 through >>> 2000. That is a 33 year run. Is this an HP/Agilent/Keysight record? >> >> On 1/16/2022 2:25 PM, Magnus Danielson via time-nuts wrote: >>> No, not for HP. The HP200A through D products where separate products >>> for 8 years, then the 200A and 200B was merged to the 200AB and the >>> 200C and 200D merged into 200CD that was running for 37 years, >>> totaling in 45 years of continuous production. >> _______________________________________________ >> time-nuts mailing list -- [email protected] -- To unsubscribe send >> an email to [email protected] >> To unsubscribe, go to and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
