Auricap XO Audiophile capacitors. On your "precision examination tools and audio circuits" we feature 1% & 2% precision silver mica, one% polystyrene and now 1% precision & two% precision metallized polypropylene capacitors nearly 2uF. We also promote Capacitor Kits and Resistor Kits for tube radios. If you're new to antique tube radio restorations