[Arran]

That whole marine beacon argument never made much sense to me, if it was a problem with Philco sets it would have been a problem with any other make and model, and not just AC/DC sets, but only Philco used these things. Obviously RCA, FADA, Stromberg Carlson, G.E, brand Z, and even Hallicrafters engineers didn't think it was much of a concern for either reason. I've always put them back in just to be faithful to the original design. By the way I have picked up a beacon around the middle of the AM broadcast band, around 1060 when I used to listen to a station around that frequency, you could faintly hear a tone repeating a code in the back ground. I'm pretty sure that it was an image, or harmonic, of a beacon from the long wave band.
Regards
Arran