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You may want to use a transformer to adjust the mains voltage to something which runs the regulators with a bit less voltage drop so the heat from them is no more than necessary.
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RA177x mains transformers are tapped at 10V intervals between 200 and 250V. In the vast majority of receivers I've come across, the tappings have been set to 230V. One of the first things I do prior to overhaul or repair is reset them to 250V. This still gives plenty of headroom on UK mains supplies and helps keep things cool.
Many RA177x transformers are mechanically noisy but seem to work quite happily. Parmeko transformers are generally worse than Partridges. Unfortunately they never seem to respond to attempts to tighten them up.