You just plug it in and it works
 Use external antenna to null or peak signals
You get absolute stability and superb performance on higher bands that can't be matched by un-neutralized tubes
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The following videos of ALS-1306 also gives good information on similar features of ALS-1406
AL-811H,SEC- HFAMP, 800W, (4)811A TUBES,US120VAC (FACTORY SEC) Features_Tuning Aid You just plug it inOnly the AMERITRON AL 811H gives you four fully neutralized 811A transmitting tubes. You get absolute stability and superb performance on higher bands that cant be matched by un neutralized tubes. You also get efficient full size heavy duty tank coils, computer grade capacitors, heavy duty high silicon core power transformer, slug tuned input coils, operate standby switch, transmit LED, ALC, dual meters, QSK compatibility with QSK 5 option and much