[R-390] What is the Crystal in the 51J filter ?

[Rodney Bunt]

I am restoring a 51J the crystal filter section is missing, so I am rebuilding it, I can make up a
switch, and even a differential capacitor. So, what is special (if anything) about the 500KHz
crystal.

Of course an original would make life easier (any offers, leads ??) otherwise would any old 500kHz
crystal do the job ??


Rodney
VK2KTZ

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