[Hallicrafters] Head Scratcher

[David Thompson]

There were SX models before WW II such as the SX-16 and 17.  I thought the X
meant crystal selectivity much as Hammarlund used in the HQ-129X et al.  I
have both the HQ-120 and HQ-120X.  The difference is the crystal
selectivity.  (wish it meant more stable HI.

Another head scratcher is the S-76.  When this receiver was introduced it
was at first called the SX-76 in Ads but later changed to just plain S-76.
I asked this question of Trav Marshall K9EBE but he told me the folks who
were involved in the S-76 were either dead or gone by the mid 1960's.  The
S-76 was the first in a line that went from the S-76 to the SX-96 to the
Sx-100.  At this point the basic design was split into the Ham band only
SX-101 or the general and severly cut down SX-110.

73 Dave K4JRB