Thanks a million, John. Rick/K5IZ John Lyles wrote: >The RCA BTA250L used same modulator and RF final tube lineup and is most likely very similar circuitry. The 250L is a neat box. You can download the manual at http://sujan.hallikainen.org/BroadcastHistory/, look under RCA. Be aware that its 29Meg filesize. > >John >K5PRO > > > >