The .47 is not an electrolytic, it's just a bypass cap. The marking is the outside foil.
You should replace the 20/20/40/40 electrolytics, and the/.47 first.
Then test it.
Replacing the rest of the (de-) coupling caps may be totally unnecessary.
You may find that the amp sounds better with the old ones.
We do not "just" replace everything. The electrolytics, OK. They fail first.
We leave the vintage caps, because that's what makes it sound like an old amp.
You are taking all the vintage out of your vintage amp.