[Hallicrafters] More S-40A Material

[manualman at juno.com]

You're not alone Randy; I guess we need to get a copy of this "standard
restoration procedure" to comply to the "standard" procedures. 

In my case I don't restore radios (receivers, transmitters, etc.) for
show, resell, or auction. I fix radios to make them operational and
within the specs that were defined. Parts get replaced that are out of
spec., shorted, leaky, or blown apart. Dings and scuffs on the cabinet or
crud on the chassis are much less important to me. I'm the only one who
looks at this stuff at my location anyway. Replacing parts that are still
within spec, just because they're old, (they're going to fail soon
because they're old) never made much sense to me. When and if it fails in
the future, then you repair it.

Geeez! I hope my family doesn't read this "standard restoration
procedure".

Pete, WA2CWA


On Sun, 3 Feb 2002 15:38:00 -0800 "Radio Randy" <rjones at theofficenet.com>
writes:
> I must be a fool, then. Thanks for the "compliment".
> 
> Radio Randy
> 
> ----- Original Message -----
> From: "JM/CO" <jmerritt2 at capecod.net>
> To: <drjgh at earthlink.net>; <hallicrafters at mailman.qth.net>
> Sent: Sunday, February 03, 2002 2:27 PM
> Subject: Re: [Hallicrafters] More S-40A Material
> 
> 
> > Replacement of all of the paper capacitors in these sets is 
> considered
> > standard restoration procedure. Some will argue that if the old 
> ones work,
> > don;t replace them. Such folks are fools. Your audio problems will 
> most
> > likely vanish after you complete this procedure. Test ALL 
> resistors.
> Carbon
> > resistors have a tendency to drift upward in value with time. 
> Also, leaky
> > capacitors can cause excessive current to be pulled through 
> resistors, and
> > this will also cause an increase in value. I have done restoration 
> jobs to
> > sets that are this old, and had to replace 80% of their resistors 
> along
> with
> > everything else.
> > Chuck N1LNH
> > -----Original Message-----
> > From: J.G. Hoffman <drjgh at earthlink.net>
> > To: hallicrafters at mailman.qth.net <hallicrafters at mailman.qth.net>
> > Date: Sunday, February 03, 2002 4:30 PM
> > Subject: [Hallicrafters] More S-40A Material
> >
> >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >I have an S-40A (Serial # HA-968798) that has an 80 (four pin 
> base) and
> the
> > chassis is stamped "80".
> > >
> > >I also have an original S-40A Service Bulletin that specifies an 
> 80
> > rectifier, and a copy of an S-40A Service Bulletin that specifies 
> a 5Y3!
> > Seems that not all S-40As are the same.  Unfortunately, there are 
> no dates
> > or revision #s on the Service Bulletins.  They do have different 
> fonts and
> > layouts too.
> > >
> > >Several questions about the S-40A, which I want to restore as 
> practice
> > before starting on the more complicated, heavier Boat Anchors:
> > >
> > >
> > >1) I need just a little "touch up paint" (flat dark gray) to fill 
> in the
> > scrapes on the case, recommendations?
> > >
> > >2) The installed speaker has a lot of distortion, I plan to 
> install a
> jack
> > in the grill at the back (no drilling) to use another speaker, 
> this can be
> > undone with only resoldering the wires and taking the jack out.  
> Or are
> > replacement speakers available?
> > >3) There seems to be some residual distortion in the audio (even 
> with a
> > better speaker), though it is listenable.  Coupling capacitor?  I 
> was
> going
> > to test all voltages/resistors, and replace the capacitors in the 
> audio
> > stages.
> > >4) If the system is working should I replace the capacitors 
> anyway?
> > >
> > >5) Is there an easier, or more straight forward, way to get the 
> dial back
> > in calibration than endlessly tweaking trimmers back and forth and 
> back
> and
> > forth until it is not quite close enough?
> > >
> > >Joe
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