[time-nuts] 5065 photo/lamp problem

[paul swed]

Magnus
Indeed the minimum required order. We are fortunate that there are some
larger vendors who have simplified that. Also ebay is good about small
counts but then they stick silly shipping costs on....
Good luck
Paul

On Tue, Jan 14, 2020 at 10:08 PM Magnus Danielson <magnus at rubidium.se>
wrote:

> Hi,
>
> Yes, I've already figured that part out. They are far from unobtainable.
> It then comes down to figuring out a quick enough way to get them, but
> I've not had time to sit down and ponder the options. If I order from a
> something like Elfa or similar, what else should I get... and well then
> I need to think about things.
>
> Cheers,
> Magnus
>
> On 2020-01-15 03:38, paul swed wrote:
> > Magnus out of curiosity I checked and those transistors are available on
> > ebay and other sites at reasonable prices. At least in the US. So thats
> > great news for you.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Tue, Jan 14, 2020 at 9:22 PM Magnus Danielson <magnus at rubidium.se>
> wrote:
> >
> >> Hi Paul,
> >>
> >> Lacking the specific transistor 2N3553 I can for the moment not progress
> >> with the rubidium lamp. It's very obvious that the oscillator is not
> >> oscillate and hence the lamp is not giving light.
> >>
> >> A friend might have those in his way to extensive component storage. It
> >> has just not materialized so far. Life may interfere with digging
> around.
> >>
> >> So, I moved a board over so I could run another 5065 and that way I can
> >> do other experiments, with the aim to measure deeper on the maser, which
> >> requires to make the 5065s better if possible. Turns out none of the
> >> 5065s is having very satisfactory phase-noise, and quick-and-dirty
> >> attempt to fix that has improved the state, so it seems that it was for
> >> sure the limiting factor for that 5065.
> >>
> >> But that rubidium lamp shall be fixed and that 5065 become operational
> too.
> >>
> >> Cheers,
> >> Magnus
> >>
> >> On 2020-01-15 00:40, paul swed wrote:
> >>> magnus
> >>> I was following the thread and it went quiet. Have you been able to
> make
> >>> progress on the 5065? Always eager to learn, because one day my 5065
> will
> >>> fail.
> >>> Regards
> >>> Paul
> >>>
> >>> On Mon, Jan 6, 2020 at 5:04 PM <cdelect at juno.com> wrote:
> >>>
> >>>> Magnus,
> >>>>
> >>>> If you apply a +20V supply to the lamp connector you should see
> >> 125-150ma
> >>>> unlit and it drops  bit when it lights.
> >>>>
> >>>> Also measure from the lamp connector center pin to the outside
> conductor
> >>>> with an Ohmmeter.
> >>>>
> >>>> You should have around 3.33K. The 1.33K resistor (in series with a
> 2.0K)
> >>>> is a common problem. it can open up or rise in value.
> >>>>
> >>>> I usually replace this resistor in units I service even if it measures
> >>>> good.
> >>>>
> >>>> I use a 1.3K 2% MOX resistor.
> >>>>
> >>>> Also check the approx. 12 Ohm resistor on the standoffs to see if it
> >>>> opened up.
> >>>>
> >>>> If  you pull the lamp assy. you can place a spec-A lead and see the
> RF.
> >>>> Should be approx 88Mhz. (not critical)
> >>>>
> >>>> Once power is applied the lamp  should start (cold) within a minute or
> >>>> so, warm it starts fast.
> >>>>
> >>>> If you place a scope on A7 TP2 and with the lamp assy removed allow
> some
> >>>> florescent lighting to fall into the interior you should see a large
> 50
> >>>> or 60Hz signal from the light falling on the photocell.
> >>>>
> >>>> That is a quick check of the A7!
> >>>>
> >>>> Cheers,
> >>>>
> >>>> Corby
> >>>>
> >>>> Cheers,
> >>>>
> >>>> Corby
> >>>>
> >>>>
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