[Hallicrafters] Novice Seeking Recapping Advice

[David C. Hallam]

I have never been in an SX110 but there is a point to remember when
replacing capacitors.  Quite often in BA's there are temperature
compensating capacitors in critical tuning circuits, such as BFO's and the
like.  These types of capacitors are no longer available.  Give a little
thought to what you are taking out before you start removing tuning circuit
capacitors particularly if the they are dog bone style ceramics.

David
KC2JD/4

> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Rob Copeland
> Sent: Friday, July 27, 2007 2:46 PM
> To: Lucek,Rudolph; hallicrafters at mailman.qth.net
> Subject: RE: [Hallicrafters] Novice Seeking Recapping Advice
>
>
> Hi Rudy,
>
> Granted it would be easier to replace only the caps but I found
> that most of
> the old carbon resistors in my SX-28 were way out of spec. So I took the
> time and replaced everything with good high quality components.
> Replace them
> with metal oxide or metal film resistors and there is no reason why you
> can't replace them with a little higher tolerance ones like replacing 1/4
> watt with 1/2 watt and so on. Yes this is an extra expense but
> your efforts
> will pay off in the long run. Don't skimp on nothing. especially in areas
> that are hard to reach. My SX-28 has an RF section that has sections that
> have to be taken apart in order to replace anything so I just
> went ahead and
> replaced all the caps and all the resistors including the silver micas
> because everything was out of tolerance. I will also be replacing
> the silver
> micas everywhere else in this unit because most of them are out
> of spec too.
> I don't think it will matter whether you desolder each piece or
> not. I just
> cut the lead and put in the new part. Just make sure that you replace any
> insulative coverings on the leads of your parts. Also, when replacing caps
> that go to ground always make the lead that connects to the ground side as
> short as possible. This will minimize the occurrence of noise and or
> oscillations in the circuit.
>
> My point is you will only get back what you put into it. If you plan on
> keeping this radio it will pay off in many ways. less drifting, better
> sensitivity, ETC. and once your done you will have a nice radio.
>
> Good Luck!
>
> Rob
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Lucek,Rudolph
> Sent: Friday, July 27, 2007 11:23 AM
> To: hallicrafters at mailman.qth.net
> Subject: [Hallicrafters] Novice Seeking Recapping Advice
>
>
>
>
> I am planning to begin my first restoration project on an SX110 that I
> purchased on Ebay.  I have not done a restoration before and would
> appreciate any advice anyone could offer.  The unit is in very good
> shape and after doing a general cleaning I plan to recap it.  To replace
> the capacitors should I unsolder them completely or can I cut the
> original leads leaving the leads soldered in place and splice in the new
> capacitors?  It seems that splicing would be easier but is it the best
> way to do the job?  Should I replace all the resistors or should I
> replace only those that test out of tolerance?  Any guidance anyone can
> offer in tackling my first project would be appreciated.  Thanks, Rudy
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