White noise test evaluation of power tubes

This paper discusses a test which measures the linearity characteristics of rf electron power tubes under conditions similar to actual operation such as data transmission. This white noise loading test for power output and signal-to-intermodulation distortion of linear amplifier tubes accomplishes the need for an improved testing technique for the more sophisticated radio communication systems and is specified by Method 2206 of MIL-STD-1311. The test method is explained and compared to the classical "Two-Tone" test. Result of tests performed on RCA linear amplifier power tetrodes demonstrated their inherent linearity. These test results showed similarities and differences to the "Two-Tone" test.