[Hammarlund] Re: HQ-170(?)

[krk@ix.netcom.com]

Also, the A model uses silicon rectifiers in the power supply while the non A (sounds 
like the R390 list <g>) uses a 5U4 tube. Hmm, that would lower its BABE factor...

Ken
http://www.netcom.com/~krk/radio/index.htm

> The "C" stands for "clock" and any paper capacitors
> should be changed out with "orange drops" or similar
> more modern capacitors.  This is true for any "boat
> anchor" equipment since paper capacitors are problems
> that are just waiting to happen!
>
> The HQ-170C is an HQ-170 with the clock-timer.
>
> The HQ-170AC is an HQ-170A with the clock-timer.
>
> From what my reference material tells me (and it is
> pretty brief), the main differences between the HQ-170
> and HQ-170A were the addition of a dial scale to add 2
> meter calibration (uses the same divisions as the 6
> meter) and the addition of a power socket to control a
> 2 meter converter (used 50 MHz as the i.f.).
>
> There also was the HQ-170A-VHF which came with the 2
> meter converter installed and a nuivistor preamp for 6
> and 2 meters.
>
> By the time you get to 6 meters, the frequency
> stability of the receiver is not that good.  It is OK
> for AM, but not for SSB.  However, when the receivers
> were designed, AM was "THE" mode on 6 and 2 meters,
> not SSB.  They have adequate stability for AM.  The
> stability of many of the HQ-170 series (and the HQ-110
> as well) are marginal on 10 and 15 meters when it
> comes to SSB.  On 20 meters and lower frequencies they
> work pretty well for SSB.  Of course, there definitely
> are exceptions and you can find a particular receiver
> that is pretty stable.  However, in general, they are
> pretty "drifty" on the higher bands.
>
> Glen, K9STH
>
>
> --- N4ue@aol.com wrote:
>
> Although I have had a few HQs that I temporary custody
> of, I now have an HQ-170A on it's way.  I cannot seem
> to find out what the differences are between the:
>
> 170A
> 170AC
> 170C
>
> Does the C stand for 'clock'??? It appears the A has a
> clock also.
>
> Also, do these old girs need the tubular caps
> replaced? 
>
> =====
> Glen, K9STH
>
> Web sites
>
> http://home.attbi.com/~k9sth
> http://home.attbi.com/~zcomco