[Techman]

It's never a good idea to replace all the capacitors in one go unless you're very confident that the values you're fitting are correct and that you're not going to make any mistakes.

C45 & 46 are the most important capacitors and I would suggest that you could replace both of these at the same time, then do a little power up with the lamp limiter to check things are still operating as before. Nearest modern values and working voltage of at least 400 volts. Then do the rest one at a time.

Mains filter capacitors could probably be left out, but if replaced then they need to be special 'X' type capacitors - don't use ordinary 400 volt ones.

The tone control capacitors are unlikely to make any noticeable difference whether replaced or not, so I wouldn't bother at this stage.

Be very careful you don't bust the glass of those output valves while you're working - and take your time.