[Hammarlund] Newly aquired HQ-129x

[D C *Mac* Macdonald]

If you are amenable to a fairly simple modification
(easily reversible by addng a small sub-chassis),
find the schematic of the product detector and AGC
circuitry from the National NCX-3 transceiver and
add that to your 129.  That's what I did to my
HQ-145X back in 1963 or 1964.  Beautiful SSB audio
AND very smooth AGC.

* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret (61-81) *
* * * * * * * * * * *
 


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> From: wak9 at cornell.edu
> To: km1h at jeremy.mv.com; Hammarlund at mailman.qth.net
> Date: Mon, 7 Feb 2011 07:27:56 -0500
> Subject: Re: [Hammarlund] Newly aquired HQ-129x
>
> Thanks, Carl. I did run it quite a bit Friday and Saturday, but have been a little nervous about it because of the caps. At least one of them is a BBOD. There's actually two that look just like the BBOD, but are radial leads, I always pictured them as just axial. I'll probably get the recap kit I've seen online and replace the resistors, too. Someone sent me the SAMS and the Ryder off list. I've always like the Sams, lots of good info.
>
> I've got two other Hammarlunds, an HQ-170 that might have been my dad's (another story on how I came by that, I think he gave it to a friend of his before he retired to FL. I knew his son, who now lives in his dad's house and this was in the garage), and a pre-war Super Pro (SP-210 with LW but no MW, The thicker, 3/16" panel with black wrinkle finish). Learned the hard way on that about the need for re-capping 8-( It needs an audio xfmr.
>
> Even in the condition the 129 is in, after alignment, I am really impressed with how it performs on SSB. With the audio at max and adjusting the sensitivity, the noise level is very low. The radio is a real pleasure to listen to.
>
> Thanks for the reply!
>
> Bill W2NVD
>
> -----Original Message-----
> From: Carl [mailto:km1h at jeremy.mv.com]
> Sent: Saturday, February 05, 2011 5:05 PM
> To: William A Kulze; Hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] Newly aquired HQ-129x
>
> I wouldnt keep running that without a recap or you may wind up frying the
> power and audio transformers and chokes. Dont forget the ones under the BFO
> shield. Also check all resistors for tolerance.
> Yours is an early model; later the panel was all white and the factory would
> include the calibrator if requested when it was in for service. In the late
> 50's I had a very late production version that was built with the calibrator
> as in the HQ-140.
>
> Normally the hottest tube is in the RF stage but after the radio is
> overhauled I suggest trying a 6SG7 in there and put the good 6SS7 in the 1st
> IF. A 6SG7 woke the set up for me on 10 and 15M back then as well as the two
> I have now.
>
> The alignment section is poorly written but SAM's has a much better
> explanation, and schematic. The WW2 Super Pro manual is excellent for the IF
> and filter alignment procedure as is the HQ-120X manual.
>
> Carl
> KM1H