[Sideband]

No point guessing with replacements. 'It's the same apart from the part number'......well it's not the same then!! It may well have a lower rating that the original. Now you have a situation of not knowing if the replacement rectifier has caused the problem or if there was an underlying problem that caused the old rectifier to fail (like smoothing caps) or if it is an entirely new fault that would have happened anyway. Selenium rectifiers even if unused, will not be reliable now as has already been stated.

You need to positively identify the resistor that is overheating by checking against the circuit. We may then be in a position to advise further.