Old One-Eye is a strong amp with plenty of Triple A mojo packed inside. As long as you avoid backing off a ladder and stepping on a binding post (story told elsewhere, and every word is true), it should last pretty much forever, or 20+ years and maybe by then you're looking at a re-cap. Maybe not. Parts quality in these amps are pretty darn stout.
Mine drives a pair of JBL 4311Bs, which were en vogue (especially the "civilian" version, the L-100s) back when I was in school. The L-100s that still run are likely on a 3rd or 4th refoam, the 4311B drivers are still working fine, I rebuilt/rewired the crossover networks in '09 (a good how-to exists in some detail on *another board*). Of note to audio historians with a taste for the bizarre, one Mr F. Zappa used 4311s to mix and master several of his albums. If only he had had some Odyssey electronics...

My girlfriend despised this picture.