[Hallicrafters] SX-25 "Second" RF Coil for Band 1

[Mike Everette]

By development ancestors, are you referring to the SX-17, SX-23, or both?

Somewhere I've seen the claim that the SX-25 is a reboxed SX-23 which was reworked to make that radio more mass-producible.  True?  I don't know.  I've also heard that the SX-24 and SX-25 were reboxings of the SX-16 and SX-17.  Hallicrafters did a lot of this.  (SX-16 begat the SX-24 begat the SX-99 eventually; S-20R begat S-40 begat S-85 begat S-108, etc.)

Good luck with "exact" Halli schematics.  I think some of their former tech writers must have trained the ones who worked for Aerotron ("Errortron"), makers of some of the world's worst land-mobile radios;  Aerotron's manuals were always at least three years behind production and some carried mistakes  forward for more than 15 years (!).

I have an original SX-25 manual but unfortunately it has a 1945 date.

73

Mike
W4DSE

--- On Sat, 3/10/12, SX-25 <telegrapher at hotmail.com> wrote:

> From: SX-25 <telegrapher at hotmail.com>
> Subject: [Hallicrafters] SX-25 "Second" RF Coil for Band 1
> To: hallicrafters at mailman.qth.net
> Date: Saturday, March 10, 2012, 10:25 AM
> The two primary configurations for
> the SX-25 were somewhat defined by its Band 1. The two
> configurations are either: 1) a single coil in the antenna
> coil circuit feeding the grid of the Second RF tube (more
> recent) or, 2) an antenna coil feeding another RF coil for
> Band 1 between the 1st RF and 2nd RF circuits (early
> version). This extra coil appears on none of the "official"
> documentation I have been able to find however one is
> obviously able to superimpose it to the standard schematic
> based on the SX-25's development "ancestors" that did show 2
> RF coils for Band 1.
> 
> Does anyone have an "official" schematic (from
> Hallicrafters) from Who-Knows-Where that indicates TWO RF
> coils in the front end for Band 1 instead of just one?
> 
> Thank you.
> 
> WA9VLK
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