[time-nuts] HP 5065A repair...

[Pete Lancashire]

That's great. Another old HP  box brought back to life.

-pete

On Sun, Jul 30, 2017 at 4:24 PM, paul swed <paulswedb at 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 at 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
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