This is a Wiltron 6637A-40 Programmable Sweep Generator 2-18.6GHz. Options: 01, 02, 03. PARTS/REPAIR. Unit will not power on. A.C. input fuse is O.K. and appears to be original. No further testing performed. *External input BNC connector (insulated type) is broken off from the front panel. No manual, cables or other accessories. As shown.






