After having salvaged an old 5065A that was decomissioned in 1987 due to Rubidium cavity heater short circuit, I have now, several weeks later eventually managed to what I think repair it. Using a GPS-Diciplined HP105A as oscilloscope trigger, the 5MHz O/P is absolutely still. "Continous Operation"is ON, and the values indicated on thepanel meter are almost matching thosewritten on the operating chart back in 1987. The next step is to take the 5065 to my work where we have two H-masers. Then it will be possible to see if it meets the old specification. A BIG Thank You to Corby Dawson!for valuable help and also to people providing the documents found on KO4BB site ("First Aid...") Ulf KylenfallSM6GXV

Ulf very good and great to hear. I did look at the clock motor driver and I believe you can use a ttl flip flop to drive the two transistors just fine. I think the ttl will run on the 4.2 V. But the transistor drive requirements look reasonable. So if you want the click click you can have it. Regards Paul Wb8tsl On Sun, Jul 30, 2017 at 6:28 PM, Ulf Kylenfall via time-nuts < time-nuts@febo.com> wrote: > After having salvaged an old 5065A that was > decomissioned in 1987 due to Rubidium cavity > heater short circuit, I have now, several > weeks later eventually managed to what I think > repair it. > Using a GPS-Diciplined HP105A > as oscilloscope trigger, the 5MHz O/P is > absolutely still. "Continous Operation"is ON, and the values indicated on > thepanel meter are almost matching thosewritten on the operating chart back > in 1987. > > The next step is to take the 5065 to my work > where we have two H-masers. Then it will be possible > to see if it meets the old specification. > > A BIG Thank You > to Corby Dawson!for valuable help and also to people providing > the documents found on KO4BB site ("First Aid...") > Ulf KylenfallSM6GXV > _______________________________________________ > 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. >

That's great. Another old HP box brought back to life. -pete On Sun, Jul 30, 2017 at 4:24 PM, paul swed <paulswedb@gmail.com> wrote: > Ulf very good and great to hear. I did look at the clock motor driver and I > believe you can use a ttl flip flop to drive the two transistors just fine. > I think the ttl will run on the 4.2 V. But the transistor drive > requirements look reasonable. > So if you want the click click you can have it. > Regards > Paul > Wb8tsl > > > > On Sun, Jul 30, 2017 at 6:28 PM, Ulf Kylenfall via time-nuts < > time-nuts@febo.com> wrote: > > > After having salvaged an old 5065A that was > > decomissioned in 1987 due to Rubidium cavity > > heater short circuit, I have now, several > > weeks later eventually managed to what I think > > repair it. > > Using a GPS-Diciplined HP105A > > as oscilloscope trigger, the 5MHz O/P is > > absolutely still. "Continous Operation"is ON, and the values indicated on > > thepanel meter are almost matching thosewritten on the operating chart > back > > in 1987. > > > > The next step is to take the 5065 to my work > > where we have two H-masers. Then it will be possible > > to see if it meets the old specification. > > > > A BIG Thank You > > to Corby Dawson!for valuable help and also to people providing > > the documents found on KO4BB site ("First Aid...") > > Ulf KylenfallSM6GXV > > _______________________________________________ > > 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. >