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Comparing 16 KSG-modules needs some preparation in setting up a proper test bench. Input of these modules is 25 Ohm symmetrical and Output is 50 Ohm symmetrical. Gain varies heavily over the entire frequency span. Also you need to have stable 50V at 25A to do all this. For 2 combined modules I'm using 2 rectifiers: 50V @ 76 A. You may agree, this is more than enough. One rectifier is enough for legal output. (750Wout) In the original KSG1300 of RFT, Berlin you find horrible DC-technology - already switch mode supplies but 25 years old - and always good for trouble. Keep in mind: Stable 50V (instead of weak 46V) guarantee highest output & lowest IMD along with low chances to kill the expensive transistors. There is not much room for adding spikes to this bipolar design. Refer to the Valvo Datasheet...

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