[Hammarlund] HQ-129x recap

[Bill Cotter]

Carl,

Is there a practical way to replace the caps under the BFO can 
without having to unsolder the many leads coming out of the can? I 
could not see an easy way to remove the can because of the switch 
and variable cap.

73 Bill N4LG




At 09:54 AM 8/11/2011, Carl wrote:
>Did you get the caps under the BFO cover? Many miss those.
>
>Check the banspread cap runout, it may not be perfectly centered 
>or someone
>messed with the rotor plates.
>
>Carl
>KM1H
>
>
>----- Original Message -----
>From: "William A Kulze" <wak9 at cornell.edu>
>To: "Robert Moses" <rhmoses at earthlink.net>; 
><hammarlund at mailman.qth.net>
>Sent: Thursday, August 11, 2011 9:01 AM
>Subject: Re: [Hammarlund] HQ-129x recap
>
>
> > Well, the recap is done and I went through the alignment, doing 
> the IF
> > according to the 'basic' instructions I the HQ-120 manual. 
> Seems to be
> > pretty good for not doing the sweep method. I've got a couple 
> of spectrum
> > analyzer modules that plug into a Tek 464, they only cover up 
> to a Mhz or
> > two, but it definitely covers audio and IF freqs. I'll try that 
> at some
> > point. The audio is nice and crisp, especially on SSB. I'm 
> surprised at
> > the stability, after a good warm up. I was listening to some 
> 75m nets and
> > only occasionally had to give the bandspread knob a little 
> tweak. Sounded
> > real good on the AM net on 3880. I have noticed that there is some
> > nonlinearity across the dial, though. Both ends are right on, 
> but as you
> > approach middle of the dial there is an increasing offset where 
> the actual
> > freq is a bit below what the dial is tuned to as you get to the 
> center of
> > the dial. Maybe I'll take some readings through the bands and 
> chart it.
> > I'm considering replacing the resistors. Some o
> > f them have already been replaced but some of the old ones are 
> off and one
> > broke as I was desoldering it in order to do one of the caps.
> >
> > This was my first total recap. I've done onesie twosie 
> replacements, but
> > not the whole rig. I'm gonna have to stock up on some caps, 
> most all of
> > the boatanchors I have are probably only in need of this and a 
> good
> > alignment.
> >
> > Sure is nice to use the radio and leave it on for a while 
> without having
> > to worry about it suddenly crapping out.
> >
> > Thanks for the input, guys!
> >
> > 73 de Bill W2NVD
> >
> > -----Original Message-----
> > From: Robert Moses [mailto:rhmoses at earthlink.net]
> > Subject: Re: [Hammarlund] HQ-129x recap
> >
> > 2 things to consider: 1: the specs on electrolytics are not 
> that tight.
> > 2. If you are worried about inrush current at startup then put 
> a low
> > resistance resistor in series with the cap.
> >
> > William A Kulze wrote:
> >
> >>Back in Jan I picked up an early model(red letter) 129x and 
> have begun a
> >>recap. Someone previously had done a partial job of it. The can
> >>electrolytic was 3 sections of 20mf, 2 at 250V and one at 25V, 
> with a
> >>separate 8mf/250V cap for one of the 10mf sections. My question 
> is, is
> >>having 20mf of filtering ok on this instead of the 10mf? I've 
> heard some
> >>things of over filtering and that some issues can arise concerning
> >>charge/discharge times and in-rush current at power up. I can 
> get the 10mf
> >>caps if I need to, but I'd like to know what problems can come 
> up with
> >>20mf instead.
> >>
> >>Thanks,
> >>Bill Kulze
> >>W2NVD
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