Hi Brian, As far as I know, Heath and Harbach boards are the same. Be careful with hardware and make sure that there is enough space between surrounding components to prevent arc over. Be sure and change the resistor in the bias circuit. Can't lay my hands on my instructions right now, but as I recall, that is covered. I also can't get to my PS-4 and 7 so I can't tell you about the screws. If the RF deck has the original power/mode switch, I suggest you install relays and switch the coils with the switches instead of the load. This is easy to do and there is plenty or room under the chassis to do it. You might also consider a soft start circuit at the same time. Both these mods are easy and completely removable with no holes. When you are setting things up, be sure that the input AC is correct for the input voltage. There is a terminal strip in the deck and one in the PS that makes this easy to do. Both must be set up for the same input AC voltage you are using. I suggest a heavy ground lead between the deck and PS. Do not rely on the internal power cable to handle this. Of course, the whole works should be properly grounded. Note that if you are running it on 240 and plan new wiring from the breaker box to handle it, you will need to run 4 wire cable, that is 2 hot, one neutral and one ground. This is a recent change in the NEC. If you presently have a 220 circuit to the shack you are grandfathered. This only applied to new work. 73, John, W4AWM
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