[Hallicrafters] Crystal information and education.

[Waldo Magnuson]

Hi,  I need a little education on crystals.  I have a SX-117 and a 
HA-10 LF/MF tuner.  To use the HA-10 I need some crystals for the 
SX-117.  In particular I need Crystal Type CA-18/U at frequencies 7.0, 
7.5, and 8.0 MC.  I need an education on what the type means and I 
would like information on where they might be available.  Thanks.
73,  Skip  W7WGM