[Hallicrafters] SX-96? (SX-88)

[Bob Macklin]

It seems to me that the SX-96 was the first SX without a crystal filter.

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"
----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: <radiocompass at yahoo.com>
Cc: <Hallicrafters at mailman.qth.net>
Sent: Monday, August 18, 2008 6:55 AM
Subject: Re: [Hallicrafters] SX-96? (SX-88)


> 
> ----- Original Message ----- 
> From: "Mike Everette" <radiocompass at yahoo.com>
> To: <WA1KBQ at aol.com>; <wq9e at dtnspeed.net>; "Carl" <km1h at jeremy.mv.com>
> Cc: <macklinbob at msn.com>; <Hallicrafters at mailman.qth.net>
> Sent: Sunday, August 17, 2008 9:45 PM
> Subject: Re: [Hallicrafters] SX-96? (SX-88)
> 
> 
> >
> >
> >>
> >> IOW they were the first truly new design since the SX-9.
> >>
> >> Carl
> >> KM1H
> >>
> >
> > You're real close to right.
> >
> > Probably the SX-71 was the first "truly new design" as it predates the 
> > SX-88 by four or five years (1949? 1950?).
> 
> 1949. And I included it earlier, just didnt give it the proper respect 
> as the innovator.
> 
> 
> >
> > The "lineage" of Halli designs is interesting, to say the least.  The 
> > SX-16 begat the SX-24 which begat the SX-99 which begat the SX-110. 
> > It may go further forward and backward.
> 
> There isnt much difference between the SX-9 and the rest of the silver 
> dial line. An extra tube or three and a few minor additions. The SX-9 is 
> a S-20R/S40 without the xtal filter. Performance didnt improve over the 
> years either, mine all sit on shelves.
> 
> 
>   The S-20R begat the S-40 which begat the S-85 which begat the S-108, 
> etc.  The S-19 did not beget the S-38; rather, it begat the S-53A which 
> begat the S-107.  Very clever.  (The original S-53 was an exception, 
> because it had the high frequency IF.)
> 
> 
> The Echophone EC-1 begat the S-38.
> 
> 
> >
> > If you look closely at the ad copy for the spreads on the S-40, from 
> > 1946, you'll notice how all the emphasis is on the styling.  Not a 
> > word about the circuitry being the same as the S-20R, except for a 
> > couple of tube updates (nothing substantive; sub a 6J5 for a 76 etc). 
> > Makes one wonder how many bought a "brand new post-war" S-40 to 
> > replace an S-20R... hmm.
> 
> 
> Every kid whose parents thought he needed the latest and greatest within 
> their budget. I still pity the kids who got stuck with S-38xxx's. Many 
> of my HS friends never got past their Novice due to them and the S-53A. 
> After the SX-25 disaster I got a used HQ-129X and found the world of 
> chasing DX. I was 16 at the time.
> 
> 
> 
> >
> > If you take a Sams for the SX-99 and compare it to the SX-110, there 
> > is NO difference in the circuitry or in the underchassis component 
> > layout.  The only differences are purely mechanical, to allow for the 
> > differences in the dial mechanisms.
> >
> > Probably the main reason Hallicrafters went belly-up was because no 
> > one could figure out how to successfully solid-state the old designs!
> 
> 
> Good point. The FPM-300 certainly was no gem but neither was anyone 
> elses SS attempts back then. Even the HRO-500 is a dog on a good 
> antenna.
> 
> 
> >
> > The SX-96's main circuit difference from the S-76 is, of course, 
> > "selectable sideband."  All that is, is a crystal controlled second 
> > conversion oscillator which can be selected to run on the high side or 
> > low side of the 1650 KHz first IF.  The S-76 uses a free running 
> > oscillator.  And, the SX-96 has a stronger BFO plus improved detector 
> > and AVC to allow AVC and S-meter function on CW and SSB modes.
> >
> 
> One that intrigues me is the SX-140 given to me which is the only SX 
> without a xtal filter. Ive added a second conversion down to 262 Kc and 
> use 2 stages of IF with old auto radio transformers. Got rid of that 
> pathetic regen IF entirely and the BFO is free running at 262Kc
> Its now very nice on AM, passable on CW, quite stable due to the very 
> low B+ they used and acceptably sensitive thru 10M. The noise limiter is 
> very good.
> 
> It came with a Knight T-150A which just needed a cleaning, some tubes 
> and audio mods.
> 
> They both now live at our cottage in Maine and its a lot easier than 
> lugging the real boatanchors back and forth.
> 
> Carl
> KM1H
> 
> 
> 
> > 73
> >
> > Mike
> > WA4DLF
> >
> >
> >
> > ______________________________________________________________
> > 
> 
> ______________________________________________________________
>