[Arran]

Philco, like any other manufacturer, used parts such as that candohm for a reason, if they could have used half Watt resistors in it's place they would have since they are cheaper. I would guess that the resistors in the candohm are at least 3 Watts if not larger, but 5 and 10 Watters are cheap enough to use as replacements, and offer a little more headroom. You also have to remember that the candohm was using the chassis as a heat sink, so if you use free standing resistors it would be wise to use ones of a higher Wattage, for the larger Wattage ones you could go chassis mount like those gold and black ones with the aluminum body.
Regards
Arran