[Hallicrafters] Caps on Selectivity switch was: RE: SX-100 Knobs

[Chris Kepus]

Sounds like a first class project, David.


Don't know about the knobs but I am curious about your re-cap effort.
(others who have been "there - done that" feel free to chime in)

What did you do to replace the caps on the selectivity switch? I am in the
re-cap process working my way in that direction.  All I have to do to feel
nauseous is look at that darn switch.  I think I'd rather chew on aluminum
foil than attack that mess. ;-)  Anyway, please tell me how you accomplished
the job and then tell me exactly how much fun it was (and that it isn't as
bad a job as it looks.)
Thanks es 73,
Chris
W7JPG 

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of David C. Hallam
ent: Monday, July 08, 2013 10:39 AM
To: hallicrafters at mailman.qth.net
Subject: [Hallicrafters] SX-100 Knobs

Did Hallicrafters use anything protective varnish or similar on the knob
skirts?  Mine were all yellowed and I assumed it was cigarette smoke
residue.  After a trip through the ultrasonic cleaner, whatever was peeling
off the skirt.  Nor just dissolving but peeling off in little pieces.

I just finished the replacing of electrolytic and film capacitors. I used
10% polypropylene except for the pass band where I used 5%. I also replaced
any resistors more than 7% out of spec using 1% metal film.

It is working but is a little deaf.  I was listening to 40M with a 2 ft
piece of wire.  Now to start the alignment.  It is SX-100 MK2.

David
KW4DH

PS: All the film capacitors were the red Tiny Chiefs.  I tested all of them
with my Sprague capacitor tester after removal.  I did only a quick test to
see if a capacitor had rated capacitance.  Only one was bad but I knew it
was bad before removal.  The resistor associated with it was burned.

Since these capacitors were 60 years old, I decided it was time for them to
be retired.
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