Hi The last time I went 10811 shopping, I found a seller with a lot of them. His price was right ($40 each) if you bought a batch at a time. I tested them all for ADEV / phase noise and the other basic bench stuff. I did not run any of them over temperature ( but neither did HP …. ).
Net result was about 5% that had some significant issue ( = you could not use them in a counter). Maybe another 20% had phase noise or ADEV that was in spec, but not that great. The balance ranged from pretty good down a few with high parts in 10^-13 for ADEV. The real issue is finding a group that has not already been sorted. There are folks who run through and do the same sort of testing. The worst 1/3 of the group then goes back on eBay …. (including the ones with significant issues). Bob > On Dec 1, 2021, at 9:11 AM, paul swed <[email protected]> wrote: > > And I will bet the smell is as bad as the larger 0106 oven. As I say its in > a sealed bag and not sure how I will recover it. Need the windows open. > The suggestion of buying a replacement is the best even if you do need to > buy 2-3 to locate a good one. > Regards > Paul > > On Wed, Dec 1, 2021 at 6:13 AM Askild <[email protected]> wrote: > >> Hi, >> >> Just a little warning. >> Included are some pictures of a 10811 where thermal fuse protection have >> not functioned. >> I do not know why, if the fuse did not work, or somebody replaced it with a >> wire, as this was in a HP 8663A that I found in a recycling bin, and I do >> not know the history. >> >> >> Regards, >> Askild >> >> >> >> On Tue, Nov 30, 2021 at 8:34 PM Bob kb8tq <[email protected]> wrote: >> >>> Hi >>> >>> The thermal fuses die on their own far more often than they die >> protecting >>> anything. The fuse is there to provide safety is certain odd situations. >>> The >>> simple answer these days is to replace it with a piece of wire. >>> >>> Bob >>> >>>> On Nov 30, 2021, at 12:05 PM, Larry McDavid <[email protected]> >> wrote: >>>> >>>> Do these thermal fuses fail spontaneously or is there a common cause? >>>> >>>> If the "heater" transistor mounting screws were quite loose, those >>> transistors themselves might have overheated and failed. But, a thermal >>> fuse should fail by high temperature... >>>> >>>> Sounds like progress, though. Cold OCXO means low frequency. >>>> >>>> Jared, I sent you a private email with some pictures; did you get that? >>>> >>>> Larry >>>> >>>> >>>> On 11/30/2021 8:03 AM, Jared Cabot via time-nuts wrote: >>>>> Well, I found it, the thermal fuse is open circuit. >>>>> If I briefly bypass it with a jumper wire, the oven pulls the expected >>> current. >>>>> Looks like I need something that will trip at roughly around 115C, >>> rated to 1.0A >>>>> (HP Part number 10811-80008) >>>>> Hopefully I can find something in Akihabara to make it easier to get >> my >>> hands on ASAP... >>>>> Jared >>>> ... >>>> -- >>>> Best wishes, >>>> >>>> Larry McDavid W6FUB >>>> Anaheim, California (SE of Los Angeles, near Disneyland) >>>> _______________________________________________ >>>> 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. > _______________________________________________ > 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.
