Thanks, everyone, for your inputs. I've ordered some NOS 4011s (made by National Semi, mildly ironic since I used to work there) and some supposedly round pin sockets (the reviews were mixed—some folks got good stuff, some got junk).
I'll update the thread once I have everything here and installed. Jeremy On Mon, Apr 3, 2017 at 11:01 PM Tom Miller <tmiller11...@verizon.net> wrote: > Also, you might install a high quality machined pin socket. Save the > non-replaceable PC board. > > ----- Original Message ----- > From: "David C. Partridge" <david.partri...@perdrix.co.uk> > To: "'Discussion of precise time and frequency measurement'" > <time-nuts@febo.com> > Sent: Monday, April 03, 2017 9:33 PM > Subject: Re: [time-nuts] HP-59309A Clock counts only seconds > > > > You can get a brand new CD4011BE from pretty much most suppliers at about > > 15 cents that won't exhibit the problems of the earlier ones. > > > > Dave > > > > -----Original Message----- > > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jeremy > > Nichols > > Sent: 04 April 2017 00:44 > > To: time-nuts@febo.com > > Subject: [time-nuts] HP-59309A Clock counts only seconds > > > > I have a new-to-me HP-59309A HP-IB Digital Clock. The clock works on both > > the internal crystal oscillator and on an external 10 MHz standard > > (GPSDO). However, it counts only to 60 seconds and then repeats without > > updating the minutes digit. The TIME SET (FAST and SLOW) push-buttons > work > > but again, the count will not update minutes and hours, only seconds. The > > DAY SET procedure works correctly for days and months. All the other > > switches and buttons do what they are supposed to do. Using my 10526T > > logic pulser I can force the minutes and hours counters to work. > > The power supply is in good condition (after replacement of a few > > components) and I see no other problems (yet). > > > > Tracing the clock signal through the logic circuitry brought me to U3 on > > the A4 board. This (U3) is a 4011 quad 2-input NAND gate in a 14-pin DIP > > package. It "connects" the seconds counter to the minutes counter and > > appears to have failed. One of the people on the email list > > <hp_agilent_equipm...@yahoogroups.com> commented that the 4000 series > CMOS > > chips have a known limited lifetime. Since these parts are no longer in > > production, the writer expressed the concern that any parts I might find > > to buy may be DOA. > > > > Before I go hunting for parts, I'd appreciate hearing from anyone in the > > group who has experience with the 59309A Clock and/or the 4000-series > CMOS > > family. In particular, are there modern equivalents to my 4011 chip? If > > the 4000's really do have a limited lifetime I'd rather use a substitute. > > > > Jeremy, N6WFO > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Sent from Gmail Mobile _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.