All R-1051 appassionatos, I am working on an old MHz Synthesizer, Its PN is 666163-400. It seems to be an older version of the one shown on NAVELEX 0967-LP-970-9010. I am looking for its schematic. Thank you, Franco KF5RXV --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com