I unexpectedly came into a small supply of the 3-pin "Universal" Mate-N-Lock connectors that plug into the power connector on the rear panel of the HP Z3801A GPSDO. If you need one of these and can't readily find it locally, contact me off-list. -- Best wishes, Larry McDavid W6FUB Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)