[Hallicrafters] SX-42 Circuit variations (?)

[GBrown]

Well, I have been into many many SX-42's. In my opinion, this receiver was a
good example of....."Lets Try It This Way"........I have run across seven
different SX-42's, yes SEVEN. This mite be a record for production changes
on one receiver. I think this receiver was only in production for 3 years. I
have two SX-42's that look the same on the outside but under the chassis,
totally different story. One of them has the old style SX-28 RF deck parts.
Regards,
Gary...WZ1M
----- Original Message ----- 
From: "Edward B Richards" <zuu6k at juno.com>
To: <W7QHO at aol.com>
Cc: <hallicrafters at mailman.qth.net>
Sent: Friday, January 20, 2006 3:57 PM
Subject: Re: [Hallicrafters] SX-42 Circuit variations (?)


> Hi Dennis;
>
> I recently did a major repair on a SX-42. Took 2 wafers out of the
> bandswitch to repair them, plus some other stuff. Worked great when I
> finished. I had 3 different schematics and the radio did not match any of
> them. Replace the .05 (?) screen bypass for the 2 6AG5's with mica or
> ceramic, with very short leads (1/8"). The bandswitch is notorious for
> shorting between rivets on both sides of wafer G, I think. It is the one
> with the plate circuit from the first RF amp on one side and the grid
> circuit of the second RF amp on the other side. If you have to work on
> the bandswitch I can give you my experience and I have some 5-40 threaded
> rod and nuts. Good luck.
>
> 73, Ed Richards K6UUZ
> Simi Valley, Ca 93065
> Home of the Air Force 1 pavilion
>
> On Fri, 20 Jan 2006 14:14:21 EST W7QHO at aol.com writes:
> > I'm currently in the process of restoring an SX-42.   Problem is, I'm
> > finding
> > significant deviations in the component values and circuit details
> > from those
> > shown in the Hallicrafters Service Bulletin (Nov. 1947, 94X242).   I
> > also
> > have a Sams Photofact Folder dated 8/48 that agrees with the
> > Hallicrafters
> > documentation.   The wiring in the set appears to be unmodified,
> > factory original
> > and is in excellent condition.
> >
> > Would appear I have an earlier/later model than that described in
> > the data I
> > have.   Anyone know more?
> >
> > Dennis D. W7QHO
> > Glendale, CA
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