[Elecraft] K2 Sn ~700 need upgraded filter crystals?

[kf4ueo]

I have an early K2 with K2SSB that has been mostly upgraded to Rev B. I don't
have any issues with my K2 but have always wondered over the years if I need
to upgrade the filter/BFO/SSB crystals. I have tended to think however "if
it aint broke..." etc. I have done the flatness SSB mod. Is it worth it?

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