The Naval Surface Warfare Center (NSWC) Crane intends to modify an existing Basic Ordering Agreement to add Klystron Tube Manufacturing and Repair requirements. This action will be a sole-source modification to Microwave Power Products (MPP) in Palo Alto, CA, as they are the only source with the proprietary data and equipment needed to avoid substantial duplication of costs or delays. Performance of services will be at MPP's location in Palo Alto, CA. No budget amount is specified, and no submission timelines are provided. All responsible sources may submit capability documents for consideration, but the government retains discretion to proceed with the sole-source award.