[Hallicrafters] SX28 again

[wa1kbq at aol.com]

I wouldn't say this too much especially around the Halli guys who are also partial to Collins but WD-40 often works when the hyped name specialty products don't. I believe someone wrote in once formerly with a Tektronix service center stating that's what they used.

Greg






-----Original Message-----
From: Guido <laffitte at prtc.net>
To: hallicrafters at mailman.qth.net; boatanchors at theporch.com
Sent: Tue, Jul 13, 2010 10:29 pm
Subject: [Hallicrafters] SX28 again


Finally I decided that I had the time and energy to haul the SX28 from the
op of the R12 speaker and into my working table. No. I don't have a
eparate shop for working on my BAs. The shack becomes the work area and for
 time it is a mess. Then it transforms again into a rather neat shack. Back
o the SX28, the work involved replacing the audio transformer with an
riginal kindly supplied by a fellow BA collector. I had noticed that
rackling noise that comes from dirty main tuning wipers so I went over them
ith some contact cleaner and then a bit a my favorite, WD40. Behold, the
rackild disappeared and overall response in all bands was great but nothing
s for free. Now I have to go through a whole alignment of the RF circuits.
t seems that whatever dirt or oxidation was there had enough effect that in
ome bands the frequency had jumped almost 50kc !. Go figure, I never
xpected this response from just cleaning those contact points. BTW, the
eplacement audio transformer also replaced the tremendously excellent audio
f the SX28.

est 73s

uido Santacana KP4FAR
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