Why RF irradiation will damage amplifier?
 

Why RF irradiation will damage amplifier?

Here our 1H amplifier of NMR spectrometer is damaged twice for long time or high power RF irradiation. Why the duty cycle is important for amplifier or probe?If the damage happens to amplifier, which part of it is broken?

edit: The type of our spectrometer is Varian InfinityPlus for solids bought in 2003. I have no idea about the sort of amplifiers, just know the amplifier is for power output. Someone used about 80kHz 1H power for 1H decoupling during 100-200ms acquisition. The efficiency of the amplifier output droped gradually. The efficiency of it reduced to one-third at one time. After an interruption of power supply, the amplifier is found no power output any more. Another event is that the electric capacity and resistance of the proton amplifier are burnt suddenly.

Thanks!



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