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Frequently asked questions and answers about the GB-4000 Frequency Generator and SR-4 Linear Amplifier:


GB4000 and SR-4 Amplifier

Rife Machine Spooky2 PERL M+ TrueRife BCX Ultra Beam Ray

Why should you consider purchasing a GB-4000 Frequency Generator and M.O.P.A. Amplifier?






The M.O.P.A. or Master Oscillator Power Amplifier uses the gas filled plasma tube radiant non-contact method of outputting frequencies from 1 to 20 million Hertz which is the largest frequency range in the industry. Many people ask what are the benefits of the M.O.P.A. over the SR-4 amplifier? First: The M.O.P.A., uses the plasma tube method. The plasma tube method allows for a greater power output of 190 watts compared to the SR-4's 15 watts output. Second: the M.O.P.A., for the first time since the 1930's, allows for the use of high frequencies directly output through the plasma tube. This has been a long sought after feature that many have been asking for. If you are wanting to use the more powerful, versatile 1930's/1950's radiant method, then the M.O.P.A., amplifier is the instrument you will want to own.

When it comes to power the GB-4000, SR-4 and M.O.P.A., should be considered as good, better and best. If your budget only allows for the GB-4000 then you have one of the best frequency generators you can purchase. If your budget allows for the GB-4000 and SR-4 amplifier then you move up to the next level of performance. If you can afford the GB-4000 and M.O.P.A. amplifier then you know you have the very best, highest frequency range, plasma tube system on the market today. You also have a system that can output both the 1930's/1950's frequencies through a plasma tube. Only purchase what you can afford because you can always add the SR-4 or M.O.P.A. amplifier at a later date.

Compare our frequency generator system with others...


Comparison Reports Now Available


We have found repeated misstatements of information by a number of other manufacturers and distributors

of different frequency devices on their websites and in emails received by OUR prospective customers.

If you truly desire to compare real data with factual information about our frequency technology instruments, including links to real time video comparison tests with additional information, then

you'll want to read a comparison paper or report.


Most people who are looking to purchase a frequency generator have in some way or another heard of the work of doctors using them for research back in the 1930s and 1940s. They also want to purchase a frequency generator that can output the frequencies which were discovered back then. The GB-4000 can output all of Dr. Rife's original frequencies. But what most people do not understand is almost all of the frequency generators on the market today, that claim to be of the design and specifications of that era, cannot output any of those higher frequencies. On some of the earlier lab notes from the 1920’s there are frequencies in the 17 million Hertz or cycles per second range. The 1930’s frequencies ranged from 139,200 Hertz or cycles per second to 1,607,450 Hertz. In 1936 those frequencies were multiplied up in harmonic steps to the 3 million Hertz range. This was done because the original 1930’s frequencies were in the AM radio band of frequencies and could interfere with AM radio stations.


You would think that if a company was going to call their machine after a prominent researcher of his day they would at least be able to output the original frequencies he discovered. But this is not the case; most of the instruments sold today only output low audio frequencies below 22,000 Hertz. Because the 1930’s/1950’s original instruments also used low audio frequencies, many manufacturers only use these low audio frequencies without also using the high RF carrier frequency in the 3 million Hertz range. These low audio frequencies were modulated or piggy-backed onto this high RF carrier frequency. When these two frequencies were modulated together they produce many other frequencies known as sideband frequencies. These sideband frequencies were also in the 3 million Hertz range and one of these sideband frequencies would line up with one of the original researched frequencies. It is the combination of the low audio frequency and the high RF carrier frequency that was needed to produce the high RF frequencies.


Because many manufacturers do not understand what we have explained they are only using the low audio frequencies, incorrectly believing they are the researcher's original frequencies. This is why the majority of the machine manufacturers claim they are using the original frequencies when they actually are only using one half of the needed two frequency combination required to produce high RF frequencies.


The GB-4000 is a 20 million Hertz or cycles per second frequency generator which CAN output all of Dr. Rife’s original frequencies including those in the 17 million Hertz range. It can use a 3.1 million Hertz high RF carrier frequency with the low audio frequencies so that the correct sideband frequencies can be produced. It is the only frequency generator capable of outputting 8 audio frequencies simultaneously which makes it 8 times faster to use than any other frequency generator. As a stand-alone machine it has a power output of 4.7 watts and if you purchase the optional SR-4 15-watt amplifier it amplifies the 4.7 watts to 15-watts. Also available is an optional 190-watt ray tube amplifier. The M.O.P.A. has a variable RF carrier frequency range from 2.2 to 3.8 million Hertz. With sideband its frequency range goes from 1.7 to 4.3 million Hertz. It can output all of the frequencies in the 3 million Hertz range and is a replica of the original 1936-39 equipment. The original 1930s/1940s ray tube instrument used a minimum of 50 to 100 watts because anything less than this was considered  to be under powered and not capable of doing the job.


Many frequency technology devices on the market have a frequency range of 100,000 Hertz or less. They do not use any RF carrier frequency. They cannot output any of Dr. Rife’s original frequencies, whereas the GB-4000 can. They are also not capable of using the sideband method used in the original 1930’s equipment so they cannot output any of the sideband frequencies in the 3 million Hertz range.


Usually it is only after people have purchased these other devices that they learn these important facts. At that time, it is usually too late to return the device in order to choose a different one with more capabilities.

M.O.P.A. 20 MHz Sweep/Function Generator GB-4000

"Life's battles don't always go to the stronger or faster man. But sooner or later,

the man who wins is the man who thinks he can."

–Vince Lombardi Jr.

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