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go to an electrical whole sale business and see if there are transformers available that meet the specifications on the side of the original units and if so then consider getting them and have an accredited electrician change the plugs / sockets for transformers to burn out I suspect that the input voltage into the transformer is not as specified on the trans former and any transformers that you get will have to have the same primary voltage as wht is available at you place
I am an electrical engineer and I do not fully understand your question. If the unit is designed to operate on 50/60 Hz, it cannot be damaged by operating it at either of those line frequencies. Mnay products today will operate at either line frequency.However, if you used an adjustable voltage power transformer (a.k.a. "Variac"), you may have "under-voltaged" or "over-voltaged" the device. If there is a circuit breaker, try resetting it. Otherwise, there may be a circuit board-mounted fuse internally that is now electrically "open." That can be tested with an Ohmmeter for continuity. (Finding a replacement may prove difficult.)
Operating a line-powered device above or below its input limitations can permanently damage internal power supply functions and, perhaps, other circuitry as well.
Solid state components can fail "open" or "shorted." If they fail "open" they will not draw appreciable current to "burn" them in any obvious way.
Was there a burning smell before at the time when it heated up slowly?A burning smell suggests there was a (possibly continuous) spark at the splitted place.If it was split earlier then the slower warming up was possibly due to a continuous spark, because then there won't be much energy left for heating.It's like an added resistance.So it could've been there for a while already. The element just needs to connect again where it splitted and should stay there, then it should work again.
the transformer has an internal thermal fuse. If you study the terminations coming out from the internals of the transformer you may notice either a pair of tinned thicker wires or insulated. This may be open circuit. I have often bypassed this internal fuse(they are notoriously common failures) to get a transformer going. You can get a replacement one from a parts supplier if you felt the need. I would just bypass it anyway.:)This may make the amp somewhat "illegal" in the US. We use the MEN (multiple earth neutral) mains power distribution in Australia and the transformer(if melting) would short out to earth and blow the mains primary fuse, the internal thermal is a US requirement.
The noise and smell usually come from a bad transformer. If the magnetron has burned out usually the transformer will need to be replaced as well. The transformer is right behind the grille on the right hand side.