[Hallicrafters] SX-100 What's going on?

[joel hallas]

Glen is on target! Some receivers have riveted tube sockets that can't 
be easily tightened. A resistance measurement from the socket ring to a 
solid ground point can read tenths of an ohm instead of zero. If you 
find that there are two choices:
1. drill out the rivet clean the chassis and replace with a bolt -nut 
and toothed lockwasher.
2. run a very short wire from the offending socket ring to a solid 
ground point.

A related problem on similar age sets is the wiper spring on variable 
capacitors. Age and oxidation can cause poor connections there too, 
often resulting in radios working in one part of the band and not 
others. Here, if you can get to the fingers, some deoxit and a matchbook 
cover can clean them up. If you can't reach, deoxit alone may do it if 
you go bank and forth with the capacitor.

Good Luck,
Joel Hallas, W1ZR

Glen Zook wrote:

>Try loosening and then retightening every screw that
>goes through the chassis.  Also loosen and retighten
>every nut on both sides of the chassis.  All of the
>ground connections in the receiver are made through
>these screws (including tube socket hold down and
>terminal strips).  This often "cures" all sorts of
>intermittent "ills".
>
>Glen, K9STH
>
>
>--- Waldo Magnuson <magnuson at mac.com> wrote:
>
>
>Any suggestions on what to look for? 
>
>=====
>Glen, K9STH
>
>Web sites
>
>http://home.comcast.net/~k9sth
>http://home.comcast.net/~zcomco
>
>
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