[Hallicrafters] Progess Report #3 of the SX-100 Problem

[Ronald Oberloh]

OK now if Black Beauties and Tiny Chiefs are suppose to be one of the main failing
components in this radio I sure am not convinced..  This one almost got me.  I new I
had bad flat topping audio but then that was what I was suppose to have when the
Noise Limiter switch  fails in the open mode.

Think I am finally finished, that is after I replace the switch.  Might do an
alignment on the front end but from what I have tuned in so far it is probably as
close as I would get it after spending a couple of hours screwing with the coils and
var caps.

Ron  WA0KDS







Dave Moorman wrote:

> Sounds like you are making good progress, Ron.  The rectangular cap could be
> a mica cap.  They usually live longer than the tubular paper caps.
>
> If a 22K resistor in the subchassis is burnt, the likely culprit is C24, a
> .02 mfd cap which goes from a transformer pin to ground.
>
> Dave
>
> > From: Ronald Oberloh <wa0kds at yahoo.com>
> > Reply-To: wa0kds at arrl.net
> > Date: Sat, 04 May 2002 14:37:47 -0700
> > Cc: hallicrafters at mailman.qth.net
> > Subject: [Hallicrafters] Progess #2 of the  SX-100 Problem
> >
> > Got the old RF generator hooked up and found another part bad.  This time it
> > was a cap between the notch module and the subchassis.  470 pf not a cap that
> > I thought would fit into the list of what I thought were Black Beauties and
> > not sure if it fits the Tiny Chiefs either  (someone will have to tell me more
> > about these).  This one looks like a ceramic in a rectangular shape but might
> > be wrong about this.
> >
> > Anyway  it is starting to sound pretty good.   I now have lots of RF gain and
> > lots of  audio gain.  Also lots of electrical noise.
> >
> > Ron WA0KDS
>
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