[Test-Equipment] wtd Faulty HP8555 mixer

[Chris Trask]

    Could you let us know who this person is who does these repairs?  I have
a pair of HP8554B's where the YIG oscillator has failed and I'm told that
they are repairable as it's usually a wire to the output amplifier.

Chris

     ,----------------------.       High Performance Mixers and
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----- Original Message -----
From: "Tod-ID" <tod at k0to.us>
To: "'John'" <morters at global.freeserve.co.uk>;
<test-equipment at mailman.qth.net>
Sent: Wednesday, November 02, 2005 7:27 AM
Subject: RE: [Test-Equipment] wtd Faulty HP8555 mixer


> I have discussed this with an acquaintance who does such repair (not an HP
> employee now). He stated that the easy way to open the module is to remove
> the module and them place it on a heat controlled hot plate. Gradually
bring
> the temperatur up so that the entire module is warmed to the same
> temperature. When you reach a particular themperature the lid will be
> "easily" removed. [I do not remember the exact temperature he said was
> necessary, but could ask him if required].
>
> I did not discuss whether or not replacement of the actual diode was
> 'challenging' nor whether exact replacements were required or alternate
> diodes were satisfactory.
>
>
> Tod K0TO
>
>
>
> > -----Original Message-----
> > From: test-equipment-bounces at mailman.qth.net
> > [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of John
> > Sent: Wednesday, November 02, 2005 6:49 AM
> > To: test-equipment at mailman.qth.net
> > Subject: [Test-Equipment] wtd Faulty HP8555 mixer
> >
> > Does anyone have a faulty yes faulty mixer from an HP8555
> > laying about they don't want?  I'm interested in finding one
> > to open up and take a look at.
> >
> > Thanks,
> > John G3UGY
> >
> >
> > _______________________________________________
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> > Test-Equipment at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/test-equipment
> >
>
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