I have two pieces of MFJ equipment, the 259 antenna analyzer and Ameritron ALS-600. The analyzer as worked good, the als-600 has been a pile of trouble, the finals only last about 3 months and I have resonant antennas and the mfj-986 tuner. Drive it with 20 watts and use the alc. It has been repaired twice and the finals are out again. Not going to have it repaired again.