Gina I don´t know much about rife machines but I have been looking in lyme-rife forums where there seems to be many people being cured with rife machines. Some seems to be a bit better than others.
I bought 2 machines from jaguar enterpises years ago and they unfortunately broke after some time, but they were a weak magnetic pulser and a bob beck silver pulser. The pulser killed some organism in the bloodstream where the blood was circulating so it did work and the magnetic pulser I wasn´t sure about. I never felt any difference after using it. After this I bought a very strong magnetic pulser which I had to connect to a car battery from another company that didn´t work either, but could probably work for other ailments. So this bob beck machine don´t penetrate your organs with the frequency, so the infections you have in an organ don´t get killed.
There are other rife machines that seems to penetrate the body better than these devices, although I have only tried one for 2 months at the most and this time was not enough my condition.