[Hallicrafters] SX-17 Recap, Redux and Other Issues.

[~DA~]

Some of you correct me if I'm wrong on this, but the
power cord is NOT soldered into the txfrmr - it just
appears that way. It's acually just a mount point.
This confused me too on my SX-16, which Ed Richards
starightened me out on. The schematic should show this
mount point as an "x" inside a circle in the line to
the on/off switch.

73,
DA

--- Bill Gerhold <wpgerhold at elongo.com> wrote:

> A short while ago I posted about recapping my SX-17
> and was dismayed at the
> tightness of the parts layout and what seemed to be
> a very difficult if not
> impossible task.  Well, I took a fresh look at it
> and decided (as others
> have suggested), to replace the caps I can get at
> specifically targeting
> ones that if shorted could cause massive of
> expensive damage or ones located
> in the AVC circuit.  So I am proceeding in this
> direction.  Incidentally,
> the 2 caps I have removed so far have a definite
> high value resistance that
> new caps do not.  So, these caps even with the meg
> ohm readings are probably
> causing performance problems with the receiver.  So
> this is a good thing to
> do.
> 
> However, I ran into a strange problem (?) as I
> looked deeper into the
> circuit.  First off, the SX-17 was not fused. 
> According to the schematic
> one side of the AC power is fed to the on/off switch
> and then on to the
> primary winding of the power transformer. 
> Apparently, the 2-wire line cord
> was replaced with a 3-wire line cord again with no
> fuse by a previous owner.
> 
> 
> I removed this line cord and noticed the chassis
> entrance hole for this
> 3-wire line cord was the exact size for a fuse
> holder.  So I grabbed a fuse
> holder from the junk box and mounted it in this
> hole.  So far, so good,
> right?  Upon removal of the 3-wire line cord, I
> noticed the following.  The
> ground wire was connected to the chassis as it
> should be and the other 2
> wires were soldered directly to the transformer
> winding!  My eyes opened
> wide upon seeing this because the on/off switch on
> the front AC switch does
> turn the radio on/off, filaments and panel lights. 
> At least it gives one
> the impression it is since the heaters and panel
> lights come on.
> 
> I then also noticed, what seems to be a strip heater
> mounted on the rear
> apron (internal).  However, there is no heater in
> the schematic or parts
> list that I have nor is there any indication of the
> (2) pilot lights on the
> schematic.  The construction; technique, neat-laced
> harness and parts
> placement all look original.  Therefore, I am
> thinking, either I have a
> modified receiver or I have a different version from
> you run of the mill
> SX-17.
> 
> Questions.  Does anyone know if there were different
> versions of the SX-17
> besides the FCC special SX-17F.  Does anyone know if
> a strip heater was ever
> employed in the SX-17 to keep it warm similar to the
> SX-111?
> 
> K2WH
> 
>
______________________________________________________________
> Hallicrafters mailing list
> Home:
>
http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Hallicrafters at mailman.qth.net
> ----
> List Administrator: Duane Fischer, W8DBF **for
> assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International:
> http://www.w9wze.org
> 



	
		
__________________________________ 
Yahoo! Mail - PC Magazine Editors' Choice 2005 
http://mail.yahoo.com