[Hallicrafters] More S-40A Material

[k6uuz at juno.com]

I Guess I am another fool.

Ed Richards

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
> > >
> > >
> > >
> > >
> > >--- J.G. Hoffman
> > >
> > >--- drjgh at earthlink.net
> > >
> > >--- EarthLink: The #1 provider of the Real Internet.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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