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Forget the analyser.  Do it the way before the MFJ 259 existed. Use you radio to key the amplifier. This is what you want in line.  Radio - SWR Meter- Amplifier-Dummy Load.


Put your radio on 10 meter CW, adjust the drive from the radio to about 10 watts.  Tune up the amplifier for max output, adjust the slug for lowest SWR, confirm that the amp is in tune, do one last tweak on the slug.  Now increase the drive to 35 watts, repeat the proceedure, now increase the drive to 75 watts (or whatever is the max input drive rating of the amp) and repeat the proceedure to obtain the lowest SWR at max drive/output.


73