received my second dead-on-arrival MFJ-4225MV power supply, I received a third unit and it works. I would have been very surprised if it was also DOA since the folks at MFJ powered it up and tested it before shipping it to me, which I assume was not done with the two DOA units.
The power supply is light in weight and small in size compared to previous high amperage DC power supplies I have owned and does not cover much territory on my crowded desk space. It features lighted meters that monitor the voltage and current and a front-panel knob detented at 13.8 volts, that adjusts the voltage between 9 and 15 volts. A continuously running "whisper" fan cools the unit; some folks might object to the volume of the whisper, but it did not annoy me.
I connected the power supply to my Elecraft KX3 transceiver, powered up and searched the radio bands for any noise caused by the power supply, but found none. The wall wart that I had been using to power the KX3 previously made its presence known on the radio bands, especially on 50 MHz, so I was happy, but not surprised that the MFJ-4225MV did not.
The MFJ-4225MV is a keeper.