Hi If the inside of the 105 went under water long enough to rust out a lot of parts on the boards, it’s a good bet that the 10811 in the unit got hit pretty hard as well.
Simple answer: Spend $40 on an eBay replacement for the 10811. It should just plug in …. Bob > On Dec 13, 2020, at 5:15 PM, Dave Miller <[email protected]> wrote: > > I am in the middle of resurrecting a HP105B, It is one of the later models > with an 10811 in. > > I have fixed the obvious issues like the electrolytics that were missing > and other parts that had leads evaporated due to corrosion. > > The basics seem to work, A not bad looking sine wave etc. > But the ADEV numbers are terrible. > I am going back to make sure it's not a measurement setup issue. That is > good. Just tested another OCXO and the test setup is good. > Attached in a link to a .tim file > https://www.dropbox.com/s/zebwiqy913v7k0k/HP105B%20test.tim?dl=0 > I am hoping one of the more knowledgeable folks might suggest where to > start looking. > I have checked all the other electrolytics and the ESR and capacitance > looks good. I think the power supply seemed clean. > > I have taken out the easy to get boards and cleaned card edges etc but this > persists. > > The saw tooth on the original phase is yelling something at me but I > don't have a clue. > > Thanks > Dave > > -- > 72 de Dave > VE7HR > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
