You might want to get the filter capacitors replaced. These are not the film caps that have been mentioned so far.
The filter capacitors are electrolytic and after a couple of decades they are often failing. It is possible for their failure to also damage the power transformer, so its a good idea to replace them.
The filter capacitors are electrolytic and after a couple of decades they are often failing. It is possible for their failure to also damage the power transformer, so its a good idea to replace them.