[Arran]

From what I read Detrolas were known for burning power transformers, at least on their motorized dial sets. If it's getting warm and drawing too much current it could be a shorted winding, both a voltage check and resistance measurements should show if anything is off. Does the schematic indicate that this set had a 650 volt high voltage winding? Most sets have a 700 volt high voltage winding, like 350-0-350, it doesn't mean that other sets did not of course, some were more, some were less.
Regards
Arran