I just picked up this Swan mark 1 Amplifier and want to hook it to my Ft-857d. The guy I got it from said I will need a relay between the radio and tuner, and I want to be sure I have this hooked up correctly. I am running power from the 13.8 volt pin and using the TX GND pin on the CAT receptacle to activate this small relay that draws 44ma. The other end of the relay uses an normally open contact to control the amp. I just don't want to damage my rig and would love the input from someone a little more experience than me in hooking these old amps to modern transceivers. Thanks!