Newbie question

I understand that my receiver puts out X amount of watts per channel.. let’s say 50 watts..
Do these 50 watts come from an integrated amp built inside of the receiver?
here’s my question..
if I am going to add a power amp to my receiver does it really matter whether my receiver puts of 50 watts or 150watts per channel if I’m adding a power amp that is let’s say 2500watts per channel..
im looking at buying a vintage receiver but if I’m going to add a power amp of 2500 watts and the receivers wattage is really of no matter then I will buy a 35 w per channel vintage receiver instead of a very costly 180w per channel receiver. Thank you for all your help