The Quad 303 is another example of Quad's brilliant engineering.Now achieving cult status the 303's were often used in broadcast applications and recording studios .They have a wonderful balanced sound , very true and accurate.This example here had its resistors and caps replaced as well as a new regulator board from Net Audio installed.Signal caps on the driver boards were changed to Elna audio caps and the output coupling caps and filter caps were changed to Vishay BC components.New fine trim pots were installed and rca connectors replaced the Din input plug.