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The problem with manufacturers using the IFR520 FET is that that device was never intended for RF. It is a high speed switching FET that just happens to work at 27 MHz. If REAL honest to goodness RF FET's were used in radios and amps then the results would be vastly different. Commercial gear has used Fet's for decades with great success. I have a 6m amp that uses four MRF151G's for 1200 watts output.n It is REALLY clean. It has to be. It was originally a Larcan television amplifier but it does require 50 volts. There are plenty of 12 volt RF FET devices out there that will run circles around the IFR520 in both power output and quality of signal.

[QUOTE="Captain Kilowatt, post: 507647, member: 39"] The problem with manufacturers using the IFR520 FET is that that device was never intended for RF. It is a high speed switching FET that just happens to work at 27 MHz. If REAL honest to goodness RF FET's were used in radios and amps then the results would be vastly different. Commercial gear has used Fet's for decades with great success. I have a 6m amp that uses four MRF151G's for 1200 watts output.n It is REALLY clean. It has to be. It was originally a Larcan television amplifier but it does require 50 volts. There are plenty of 12 volt RF FET devices out there that will run circles around the IFR520 in both power output and quality of signal. [/QUOTE]

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