[Hallicrafters] Re: Hallicrafters Digest, Vol 35, Issue 8

[Joe Bob Brunson]

Mark,     
    This is just a guess, and 
tracing out the circuit of the extra switch and phono
jack will confirm 
or deny this, but I suspect it is a phono input.  I
have seen a 
number of radios of this era with similar
modifications.  The audio 
stage of the SX-25 is supposed to be pretty nice
sounding (I have one I 
am going to refurbish and another parts unit...the
parts unit has an 
unmarked switch in the same location as yours), but I
haven't heard one 
yet to be able to testify to this.
     
    I'm 
almost done with an SX-24, which is the little brother
to the 
SX-25.  Just need a little touching up of the paint on
the cabinet, 
need to 
make a bottom cover (I am now making a template for
this) and still 
need 
to find a pesky hum, noticable on bands 3, 3a and 4
when the BFO is 
on.  It's a pretty impressive set, considering it was
fairly modestly 
priced.  Since the SX-25 is basically an upgraded
 version of the SX-24, I think after some
refurbishment you should get 
a lot of enjoyment out of your receiver.


> Message: 2
> Date: Sat, 9 Dec 2006 18:04:11 +0000
> From: "M. A. Phillips" <n8uvq at juno.com>
> Subject: [Hallicrafters] SX-25 Super Defiant
> To: hallicrafters at mailman.qth.net
> Message-ID:
> <20061209.180423.-183425.0.N8UVQ at juno.com>
> Content-Type: text/plain; charset=us-ascii
> 
> After many years of hearing my father and his
> parents
> speak about their "Hali SX-25" (their words not
> mine)
> during the World War II years, I finally located
> it,on
> Thursday, buried in the attic of my grandparent's
> garage.
> I have yet to download a manual from BAMA or order
> one.  Also, I have yet to opened it or wiped off the
> dust.
> 
> This particular SX-25 does not look exactly like
> others
> pictured in Hallicrafters advertisements, Chuck
> Dachis'
> book or pictures from the Internet.  Here are the
> two
> differences: on the rear of the chassis between the
> two
> antenna termination points and the external switch
> connection point is a female RCA chassis mount
> connector.  The center insulated part of the RCA
> connector appears to be porcelain.  I have seen one
> or
> two pictures of other SX25s with the RCA connector.
> I assume it's an antenna connection point, too.
> 
> The remaining difference is an additional toggle
> switch
> in perfect alignment with the other three toggle
> switches,
> on the radio's front, near the bottom of the SX25. 
> This 
> particular toggle switch is below, but centered
> between
> the AFC knob and pitch control knob.  It appears 
> identical to all of the other 4 toggle switches. 
> However, 
> this switch does not have its function painted on
> the radio's 
> front.  The serial number is H-136881.
> 
> My 85 year old uncle does not recall making
> modifications
> to this particular SX25, because he enlisted in the
> Army in
> late 1940 and was in Europe during World War II.  My
> father was drafted in 1944.  Regrettably, I can not
> ask my 
> grandparents or my father about modifications or
> repairs.  
> All three are deceased.  
> 
> If anyone has an idea about the above items I would
> like
> to hear them.  I may order a reproduction manual and
> schematics next week, if time permits.  If BAMA has
> a 
> manual, I'll download it later today.
> 
> 
> -
> ****************************************
> 73 de N8UVQ  (Mark)
> e-mail: N8UVQ at juno.com



 
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