[Hallicrafters] More S-40A Material

[Radio Randy]

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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