[Hallicrafters] SX-100 Knobs

[David C. Hallam]

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.
-- 
"I predict future happiness for Americans if they can prevent the 
government from wasting the labors of the people under the pretense of 
taking care of them."
Thomas Jefferson