[Hallicrafters] SX universal transformers.

[Joe Bob Brunson]

I've seen the S-20R type mentioned below...I have an
SX -17 with a slightly different type...there is a
cover on top of the transformer, under the cover there
is a wire with a pin connector on the end.  There are
several slides for this pin connector labeled with
several voltages, IIRC 110, 130, 150, 210, 230, and
250 volts.

WB6FQL


> Message: 2
> Date: Mon, 4 Jun 2007 15:05:17 -0700 (PDT)
> From: Douglas <iluznst at yahoo.com>
> Subject: [Hallicrafters] SX universal transformers.
> To: hallicrafters at mailman.qth.net
> Message-ID:
> <869872.60851.qm at web55705.mail.re3.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
> 
> What is involved in making a an SX-62 an SX-62U, is
> it
> a completely different transformer or is there some
> other circuits in there. Anyone with a SX-62U
> schematic.
> 
> Since the question begs answering, yes I'm
> considering
> using this on 220 volts, although I'm also
> considering
> using a step up/step down transformer which might be
> easier and safer to deal with.
> 
> Suggestions, ideas, comments...?
> 
>
> 
> Message: 5
> Date: Mon, 4 Jun 2007 18:10:09 -0700 (PDT)
> From: Mike Everette <radiocompass at yahoo.com>
> Subject: Re: [Hallicrafters] SX universal
> transformers.
> To: Douglas <iluznst at yahoo.com>,
> hallicrafters at mailman.qth.net
> Message-ID:
> <368754.14845.qm at web52103.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
> 
> I have encountered two Halli receivers with 115/230
> "U" transformers, and in each case the only
> difference
> is the transformer itself.  In the S-20R and S-40,
> there are selector knobs on top of the transformers
> to
> change the primary configuration from 115 to 230.  I
> also have a universal transformer for an SX-28, and
> this one has a slide switch on top.  I don't think
> there are any other changes necessary to make a "U"
> version.
> 
> Yes, the transformers are different; I think all of
> the "U" versions have a dual primary with windings
> in
> parallel for 115 and in series for 230.
> 
> Too bad you didn't ask earlier; about a week ago at
> a
> hamfest I saw some NIB Triad 230/115 500 watt step
> down isolation transformers, going begging at $10
> each.
> 
> 73
> 
> Mike
> WA4DLF
> **
> 



 
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