I have a 19 year old X24K and it doesn't even get luke warm, I also have several X-Can revisions and that's another story, you can almost fry eggs in the V2, mine are still in good condition, I only had to replace the tubes a couple of times.
Good low ESR electrolytic caps are more than good enough in this case, using tantalums will increase the cost by 10x, I don't even know why they used them in the first place.
The X24K is still a good sounding unit (it sounds warm and performs well when fed 24bit 96khz signals), but nowadays you can get the same or better performance for peanuts, so I woudn't spend more than necessary for repairs.
Good low ESR electrolytic caps are more than good enough in this case, using tantalums will increase the cost by 10x, I don't even know why they used them in the first place.
The X24K is still a good sounding unit (it sounds warm and performs well when fed 24bit 96khz signals), but nowadays you can get the same or better performance for peanuts, so I woudn't spend more than necessary for repairs.