[Hallicrafters] SX-99 and SX-110

[Mike Everette]

--- "Paul Manno, KG4UVU" <kg4uvu at arrl.net> wrote:

 I also believe coil L3
> (bands 1 and 2) was the 
> same one used in several other models (e.g., SX-99)
> though I am not 100% 
> sure of that.

The only difference between the SX-99 and SX-110 is
the front panel, type of dials, and the mechanical
arrangements to accomodate the slide-rule bandspread
dial.  If you have a 99 manual, or especially a Sams
Photofact for a 99, you will find that the 110 is
electrically, and largely mechanically identical.  The
chassis layout and tube lineup are identical, as is
the component placement.

The S-85 and S-108 are other sources of the coil you
need.  The front ends are identical.  In fact, the 85
and 108 are the same radio behind a different panel,
just like the 99/110.  The 85 is the 99 without
crystal filter and S-meter, just as the 108 is the 110
without these features.

If you're curious, study the design of the
1939-vintage SX-24, and you'll discover the antecedent
of the 99/110.  In the same manner, the S-20R became
the S-40 series with a new cabinet and some tube type
updates, then underwent some further tube changes and
a slight adjustment in upper-limit frequency coverage
to morph into the S-85 and then the S-108.

73

Mike
WA4DLF


		
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