Dis-assembly can go either way. I have had some potted transformers that needed to sit on top of a hot wood stove for a while before there was any chance of extraction, and I have also had some that the tar was so brittle that it broke away from the can, and dropped out like a cake from a pan on a cooking show.
: does any one know where I can obtain a "filter reactor" or equivalent for radiola 62.Continuity tests show it defective.Schematic looks like a transformer,connected between 5 volt filiment section of transformer of UX-280 tube and the center tap of plates for the "80".Please help,This baby is incased in tar and a metal can.Could be a messy dissection.MIKE