Another factor was the service problem. Many of the servicemen did not know how to service a color set. RCA conducted service seminars through their distributors in an effort to correct that deficiency, but those who attended still had to purchase a lot of expensive test equipment if they were serious about it. For the small percentage of color sets, it was hardly worth the investment. There were many small shops who were still paying off loans on their monochrome test equipment. Of course all of that changed suddenly around 1964. Then you had to make the investment to stay in business.