Hi Ed,
Why will it need the speakers replacing? are the cones damaged, they just used paper cones on the R-81 not ones with foam surrounds, if form surround spears have been fitted and they have since rotted you can purchase form surround kits.
I can not tell you if the jukebox is worth repairing, if you are doin it to sell on then the answer would be no but if you want to end up with a good sounding jukebox that looks like a lat 70's jukebox with a fair amount of chrome then this is a good option.
Regards
Alan
Alan Hood
ami-man
UK