CPI - Microwave and Power Technologies
"In 1948, Russell H. Varian and Sigurd F. Varian, the historical founders of CPI's business, founded Varian Associates and introduced the klystron as its first commercial product." - History
CPI BMD designs and manufactures a broad range of RF and microwave products for radar, communications and scientific applications.

RF Fact Check
Why SSPA, TWTA, or KPA?
When choosing amplifier technology, the typical factors which are considered are price for the power level desired, efficiency, operating costs, weight, size and bandwidth......
Communications & Power Industries LLC
607 Hansen Way, Palo Alto, CA 94304-1015, USA.