[Hammarlund] HQ-170 vs. HQ-170A - Differences?

[Al Parker]

Hi Roy,
    Quick shot at it -- The A has fil. voltage on the 1st mixer &
oscillator tubes when power is off, and also has diode rectifiers in the
p.s.  (no difference in transformers).   The A may have a flip top case,
not sure if that applied to the 170A or just the 180A.  They're both nice
rcvrs, the A a little better just for those reasons, I don't remember any
other ckt differences, and I've had some of each.  I put a small fil. xfmr
that was only stout enuf for one tube, the osc.,  into 2 "plains", and it
helped noticeably, plus SS'ing the p.s. to reduce a little heat.  Watch
out for stuck slugs in the RF & IF cans.
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message ----- 
From: "Roy Morgan" <roy.morgan at nist.gov>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, March 01, 2005 3:54 PM
Subject: [Hammarlund] HQ-170 vs. HQ-170A - Differences?


> Hammarlun-ites,
>
> I just got an HQ-170A, (working but not well.)
>
> What's the difference compared to the HQ-170?
>
> Experience, advice, lore and stories on the 170A welcome.
>
> Roy
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Cell 301-928-7794
> Work: Voice: 301-975-3254,  Fax: 301-948-6213
> roy.morgan at nist.gov --
>