The MFJ-5124Y interface provides power and control signals between a Yaesu radio and the MFJ automatic tuner
 Use external antenna to null or peak signals
The following videos of ALS-1306 also gives good information on similar features of ALS-1406
Also read inductance in uH and capacitance in pF at RF frequencies
Features efficient end-loading
AL-811H,SEC- HFAMP, 800W, (4)811A TUBES,US120VAC (FACTORY SEC) Features_Tuning Aid The MFJ-5124Y interface provides powerOnly 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