ORIGINAL: CGRetired
As Ken suggests, stick with the manufacturer's crystals that belong in the receiver. And NEVER.. EVER swap out transmitter crystals. That is not good for the same reasons as above, AND it is illegal.
CGr.
Note: There ARE second party manufacturers that make crystals for specific brands of receivers. ( My LHS sells them... )
These should be fine, as they are made to conform to the specifications of the originals...
However only the "big boys" are targetted so you'll only find second party crystals for Hitec, JR, and Futaba, which will be labeled as such.