The GB-4000 is a 20 Megahertz Sweep/Function Generator, also known as a Frequency Generator. Though it will output the frequencies that Dr. Rife used in his instrument, we do not call it a “Rife Machine”. Dr. Rife did not want his name put on any instrument. Because most of the manufacturers of instruments today call their instruments “Rife Machines” we have used this name for this comparison chart.

The comparison chart below first starts with Dr. Rife’s #3 * instrument that was built with the Colin B. Kennedy equipment that he used from 1923 to 1935. The #3 instrument was called the Rife Ray #3.  The second instrument on the chart is Dr. Rife’s 1935 #4 * instrument. It was called the Rife Ray #4. We will not compare Dr. Rife’s first instrument because very little is known about it. His second instrument became his third instrument when he increased its power level from about 10 watts to 50 watts output.  Dr. Rife’s Colin B. Kennedy equipment was just off-the-shelf standard frequency generating equipment of the 1920s. Many frequency or function generators sold today can output the same frequency range that Dr. Rife used but they lack sufficient power. Only about 1/5 of 1 watt (0.20 of 1 watt). Below is a comparison of features of many of the instruments sold today. If you wish to have a greater understanding of Dr. Rife’s instruments we suggest that you read the paper “A History of Rife’s Instruments and Frequencies.” Pages 11 through 27 deal with the Rife Ray #3 Kennedy equipment. Pages 28 through 31 deal with the Rife Ray #4 instrument.