I just refurbished the old Omega Solid State timer for a friend. Its the little box that forms the top of the "Power Tower" for the Chromega light source.

That is a fantastic little circuit. All resistors (high quality) and capacitors (Sprague 'orange drop') and a single SCR (that was blown). Very straight forward design. Big relay with easy to clean contacts. No complex integrated circuits or rare components.

If I ever see one of these in a box of junk I'm going to pick it up for myself. Should be easy to get working.