Make sure you have it professionally reconditioned. Components like capacitors will need to be replaced, pots cleaned… of it isn’t likely to sound very good.
generally, a wholesale change of capacitors is not required. Film capacitors age very well and only require replacement if faulty. Some premium electrolytics may still be going strong after 30 years and their replacement by inferior substitutes may result in performance degradation. Some potentiometers may still be functioning without fault. The key is to ASSESS before you act.