You could call MFJ/Ameritron and ask them what the actual specifications are. Or, you could ping on Tom/W8JI for info. I understand your concern about size, weight, and cost. But, for me, a piece of equipment that compromises performance because of [fill in the blank] is a piece of equipment that won't get much/any use. In my case, my 160m GS-35b project will use a Heath SB-220 outer case and I won't have room at all for the 45# plate xfmr or the 35# 1H/800mA choke. So, the plate supply will be housed in a separate chassis that I'll fabricate. The RF deck will be lighter than my SB-220. I may also build amplifiers for 6m and/or 2m so, the separate PS works out to be a very good idea. You might consider that, especially if you come upon the deal of the century on a behemoth xfmr!