Mike wrote: "Well...it'll be a bit of a challenge to use a crystal for the nt-60133 calibrator (FT-243 holders) in the TBX transmitter, which uses (God only knows why) the large round heavy semi-unique nt-40024A crystal holders." One can, (GASP!) turn a TBX crystal holder into an adapter that holds an FT-243 inside, as I did. Rob