Tim StationeryWhat is the best lubricant to use for the sliding piston valve that switches sound from the radio to the phonograph tone arm on the Victrola Orthophonic 7-3 ? By the way, if you use a low wattage amplifier (preferably a tube amp) connected to a impedance matching transformer connected to the Radiola speaker driver, you can listen to your iPod through the Orthophonic speaker. Quite a treat! Also, does anyone know what color and material type that originally was used for the grille cloth? Thanks, Tim