[Hallicrafters] SX-73/R-274 Alignment?

[Al Parker]

Hi Rock,
    Congrats on getting one of the nicest.  I like it as much, and in some 
ways more, than the SP-600.  Yes, it definitely is built differently, more 
mil-type, but it was designed/reconfigured some yrs after the SP-600.  Both 
are to the same specs, just widely diferent implementations.  I got my first 
4 yrs ago, I've got ~3 pgs of shop notes on it which I scanned & can fwd to 
you if you'd like.  1 pg is on the differences between it & the SP-600.  The 
others are notes I made as I got into it, you'll have to follow trhu to see 
what I suspected & what really was, to some extent.
    I replaced all the bathtub caps, most were slightly leaky when ckd with 
the megger.  It appears to me that the AVC is active on CW, it's derived in 
a way to avoid the BFO blocking it, IIRC.  Don't think I saw any gotchas in 
there.  P.S. filter cap was bad.  It did benefit from a good alignment. 
Note that the S-mtr essentially has a "squelch", doesn't register until thte 
AVC voltages reaches a certain value.
    I regret to say that I haven't used it a lot, did plan to put it in 
place of the "shop" SP-600, but have not yet gotten a round tuit.
    I didn't get on fone CX, and probably won't for CW this wkend, there's a 
local fest, might get on in the evening a bit, will look for you if 40 is 
open to your coast then.  Not sure what I'd be using, maybe just 1 rig, for 
the short time available.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

"there is nothing -absolutely nothing- half as much worth doing as simply 
messing about in boats."
   Ratty, to Mole


----- Original Message ----- 
From: <lardiere at ix.netcom.com>
To: <hallicrafters at mailman.qth.net>
Sent: Monday, October 06, 2008 11:42 PM
Subject: [Hallicrafters] SX-73/R-274 Alignment?


>
> Gents,
>
> Just picked up a small pile of boatanchors including an R-274 in very good 
> condition.  It looks stock except for the bandswitch knob, which is 
> common.  The tuning knob and dial lock seem to be intact.
>
> I have a copy of the SX-73 manual.
>
> Before I dig into this thing, any alignment hints?  Any known "bad" 
> components?  I have aligned a lot of Hallicrafters, but this is the first 
> R-274 I have owned.  It looks like a very well built and well designed 
> receiver.
>
> Any ideas about using this on SSB?  Does the AGC work on CW?  That's not 
> clear from the manual.  I will be bringing this up very slowly to see what 
> I have.
>
> Ideas welcome.
>
> 73,
>
> Rocco "Rock" N6KN
> ______________________________________________________________
>