[time-nuts] Normal operating specs of a Morion MV89?

[Bryan _]

Any tips on resoldering the can, special solder or flux required? Quite often they can be found for a good price on Ebay, from what I have read they are a  good OCXO minus the issue of the one particular cap failing.

-=Bryan=-
 
> From: brayniac at gmail.com
> Date: Tue, 20 Sep 2016 20:06:59 +0000
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Normal operating specs of a Morion MV89?
> 
> Yes. This low output due to capacitor failure is a very common failure.
> From the last set of MV89a I got on the bay, all had this issue.
> 
> I had good luck opening mine with a hot air rework station with a small
> nozzle to blow the solder seal away. A bit of careful prying with a thin
> flat screwdriver while it is still hot to pop the bottom from the case. The
> capacitor is easy to get to once the outer can is removed. Hot air to
> remove. Then tweezers and a fine point soldering pencil made for an easy
> repair.
> 
> Obviously, be very careful and be sure to work on an appropriate surface
> for the amount of heat involved.
> - Brian
> 
> On Tue, Sep 20, 2016, 12:57 PM Bryan _ <bpl521 at outlook.com> wrote:
> 
> > May also want to check the output amplitude. If memory serves me correct
> > it is very common for a capacitor inside this model number to fail. It can
> > be fixed but requires a torch or a pretty heavy duty soldering iron to get
> > the can open.
> > http://www.rbarrios.com/projects/MV89A/
> >
> > -=Bryan=-
> >
> > > From: listertim at gmail.com
> > > Date: Mon, 19 Sep 2016 14:31:06 -0700
> > > To: time-nuts at febo.com
> > > Subject: [time-nuts] Normal operating specs of a Morion MV89?
> > >
> > > I recently ordered and received what claims to be a 2007 vintage
> > > Morion MV89 from ebay (I say claimed as that what the auction item
> > > said, but my unit is missing the identifying label on the top and just
> > > has '2007 MV89A' written on the side in marker). I've powered it up
> > > with a bench power supply at 12V and it's drawing 390mA at steady
> > > state. I measured the case temperature with a ThermaPen Mk4 (not often
> > > I get to combine the hobbies of bbq and timenuts...) which is
> > > calibrated to +/-0.7F to be about 111F, varying somewhat with
> > > position.
> > >
> > > This seems pretty hot - Is this normal ? The datasheet says it should
> > > draw <350mA when at steady state but doesn't say what temp it should
> > > be at. Does anyone else have info on their version to see whether this
> > > is normal ?
> > >
> > > Cheers,
> > > Tim
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