[Arran]

It looks like it's probably a form of cathedral tombstone, or maybe just a tombstone, other then Philco nobody else was making sets in true cathedral cabinets into the 6 volt era. That is a weird circuit, it appears that the tubes are in a series string, including the rectifier, and that the string is powered from a tap off of the high voltage secondary, probably 25.2 volts at 300 ma, there are no seperate filament windings. The closest Canadian equivalents to this set with four tubes still had filament windings, a 5 volt and a 6.3 volt winding, and a normal center tapped high voltage winding with a type 80 rectifier.
Unfortunately since transformer gone there isn't much hope of finding a new off the shelf replacement, if it were still there but burned it could be rewound. Unless you can find a replacement salvaged from a parts chassis, or by some miracle find a new old stock one, I think you will be in for a re-engineering project to get it running. It may be possible to find a transformer with a 25.2 volt 300 ma secondary, but as a stand alone unit, and find another for the high voltage side, or get a transformer for a set equiped with a type 84 or a 6X5 and rewire the filament circuit, it will require a 1.2 amp 6.3 volt filament winding. You could also go transformerless but then you would need something to drop the line voltage like a big capacitor or resistor if you don't plan to really alter the set. Unless you are really in a hurry to get it going I would put it aside for now if you have other projects pending.
Regards
Arran