[Hammarlund] HX-50

[rrkrr]

I have one here I was working on a couple of years ago, and ended up
setting aside.  There were HX-50 and and HX-50A models as I recall, with
several minor changes.  Mine came without the 160 meter coils and
crystals, but I stumbled upon someone who had an original kit of parts
for installation of this band - apparently Hammarlund would sell the rig
without Top Band band at a lower price in the era when Loran made the
band unusable in some parts of the country.  A previous owner had also
considerably modified the power supply on mine, and I was in the middle
of fixing that when I stopped working on it.   I'll look up the mods
that are documented in the paperwork I have. 
Bob
K4ERR

Robert Nickels wrote:
> I've been working to get an HX-50 going with it's matching HXL-1 
> amplifier and thus far, my opinion of the amp is much higher than that 
> of the transmitter ;-)
>
> I know the HX-50 may be the Rodney Dangerfield of sideband transmitters, 
> but this one looks like brand-new, and seems to work more or less, so 
> I'm kinda motivated to get it going as well as possible. 
>
> Does anyone know anything about how many were made, and what changes 
> were made over the production run?  (original '61-'64 model, not 
> including the later HX-50A). 
>
> I ask because the audio section (at least) of this one is wired 
> completely different from the schematic W8UT uploaded to BAMA (thanks 
> Al!).  The mic gain is in a different stage, vox circuit is different 
> (and doesn't work well), and I've found differences in the balanced 
> modulator (which doesn't balance as well as most rigs).  Hammarlund did 
> some odd things, like using two relays with high resistance coils wired 
> in series, and operated from the low B+ supply.  This puts B+ on the PTT 
> line which I don't like, but worse yet, my transmitter is wired such 
> that neither of the PTT terminals goes to ground as the schematic 
> shows.   I also found half the drive level pot element, which seems odd 
> considering the circuit (assuming it's wired per the schematic).  The 
> best audio report I've had thus far is "folks will sure know you're 
> using a boatanchor" - but that's not something I'm shy about ;-)
>
> Anyhow, mine is stamped "518" on the rear panel which I take to be the 
> serial number, and I'm just curious if anyone knows whether this would 
> be early, late, or what, and whether others have found discrepancies 
> from the BAMA schematic.
>
> Thanks and 73,
> Bob W9RAN
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