Actually if your speakers have foam surrounds they could have rotted by now. You should inspect them because if you run them without the surround much you can damage the voice coils. New surrounds are cheap and easy to replace. Once done the speaker is as good as new. I'm presently listening to a pair of Dynaco A 25's that were made in the early seventies. Rubber surrounds so no rot. They work fine and sound pretty good too.
