[Hallicrafters] SX-28A S-Meter

[Al Parker]

Hi Mike, et al,
    Roy & I agree, it sounds like it could well be mechanical, inside the
meter.  Open it very carefully, inspect closely, with a magnifier & good
light, for particles of anything in there, particularly magnetic bits in
the poles, where the bobbin rotates.  A little spec of steel wool, or some
such, can really make things miserable, and erratic.  Also, IIRC, that
meter pot is also suspect, it's large, high wattage, 'cuz it carries plate
current of one stage (I think), and I believe I've had a problem with one
or more.  Disconnect wiring, hook you ohmeter to it, and see if it's
smooth (and abt the right value).  Similarly follow Roy's advice on the
meter.
    Good luck,
73,
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: "Mike Smout" <mikesmout at sympatico.ca>; <hallicrafters at mailman.qth.net>
Sent: Tuesday, April 26, 2005 11:37 AM
Subject: Re: [Hallicrafters] SX-28A S-Meter


> At 10:47 AM 4/26/2005, Mike Smout wrote:
> >...the S-meter. Up until yesterday afternoon I assumed that static
> >electricity was the culprit...When the needle gets anywhere near the
zero
> >position it moves over and locks onto it (zero) and will not move
unless
> >you gently tap it.
>
> Sounds like dirt in the meter movement.
>
> Have you CAREFULLY applied current to the meter from a separate source
to
> see how it behaves?  I'd do that.  You may find that it's got something
> inside it causing the sticking.
>
> Treat it carefully. SX-28 meters are very hard to find. Very.
>
> 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 --