[Hallicrafters] SX-100 and the SX-101CMKIIIA

[WA1KBQ at aol.com]

The "X" designation in all early Hallicrafters receivers always denoted a 
model with a crystal filter to differentiate it from that same model without the 
crystal filter. Later Hallicrafters receivers featured dual conversion, 
passband narrowing and or filters that did not have a crystal as engineering 
refinements were adopted and circuits were better designed. Is it possible 
Hallicrafters included the "X" in the model prefix of later models without a crystal 
filter to denote receivers having crystal controlled 2nd conversion oscillators?

Regards,
Greg Gore; WA1KBQ
Charlotte, NC