Thanks, Charles. I'll give it a try. Wanted to ask before attempting what will be for me a new procedure.
I suppose I could also try replacing C117, the Fine Frequency Adjust capacitor, to see if that has any effect. C117 is a 6.8-99 pf variable geared to a shaft revolution counter. The counter is at maximum (600) but the manual doesn't say if that is at the minimum or maximum end of the capacitance. I have the manual (got a copy from Artek) and read the oven temp procedure. Tedious but do-able. Jeremy On Thu, Sep 28, 2017 at 5:50 AM Charles Steinmetz <csteinm...@yandex.com> wrote: > Jeremy wrote: > > > The only thing I've not adjusted is the oven temperature. > > I know there's been discussion of this subject here in the > > past but my searches come up empty—I must be using the wrong keywords. > > The 103AR is just a toy for me so no harm is done if the frequency can't > be > > raised to 1 MHz but if it's possible I'd like to try. Have I missed > something > > somewhere? > > To adjust the frequency trim range, replace selected capacitor C103 > inside the oven (nominally 18pF). Use a C0G/NP0 ceramic. Note that HP > indicates this "Component [is] not separately replaceable." But at this > point (nearly 60 years on), opening sealed oven assemblies has become > routine for those who maintain old HP standards. > > The procedure for adjusting the oven temperature is described in > paragraph 8-11 of the operating and service manual 01037-2 (printed Jan > 1962). Be advised it is somewhat tedious. > > If you do not have the manual, you can download it here: > > < > http://www.ko4bb.com/getsimple/index.php?id=download&file=HP_Agilent/HP_103AR_quartz_oscillator_op_service_manual_1962.pdf > > > > Best regards, > > Charles > > > _______________________________________________ > 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 my iPad 4. _______________________________________________ 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.