. . . . "Multistage depressed collector with efficiency of 90 to 94 percent for operation of a dual-mode traveling-wave tube in the linear region" . . . . . . "Multistaged depressed collector with efficiency of 90 to 94 percent for operation of a dual-mode traveling-wave tube in the linear region"@en . "Multistaged depressed collector with efficiency of 90 to 94 percent for operation of a dual-mode traveling-wave tube in the linear region" . . . . . . . . . . . .