[Hallicrafters] Progess of the SX-100 Problem

[Ronald Oberloh]

Removed the sub chassis today and found one resistor a 22K burned in
half.  Because this unit is so hard to work on  I went through and
checked all the resistors in the sub chassis before I reassembled it and
found one 100K as 125K and a 120K as 170K so replaced them also.  All the
rest of the resistors were almost right on the money.   So after getting
the think back together I did the 50 Khz alignment on it and sure had to
move the slugs a long ways.  It seems like someone down the road was
trying to get this radio to work and totally messed up the alignment
doing so.  My experience with these old radios is that if you can find a
radio that was aligned at the factory  and the radio fails if one
replaces the  bad part the factory alignment will still be right on or so
close it really will not make any difference.

I  still am not satisfied with the audio yet but don't think the problem
is in the audio circuit because I ran an audio generator and scope on it
and it looks very clean and goes from about 100 Hz to 3 KHz with roll at
both ends.

Tomorrow will put an RF generator to it and see what surfaces. I expect
it will be replace some caps that have turned into very small  caps over
time.

Ron  WA0KDS