Additionally, maybe the beginning serial number? I bought my VI Plus/564 from a ham in GA; not sure when he originally bought it. Scott? 73 de Jim - AD6CW --- John L Merrill <jmerrill1 at adelphia.net> wrote: > I suppose i could ask Ten Tec this but does anyone > know when or if they put > the TCXO in the OMNIVI+(564)? > > John N1JM