 Victoreen began his career in Cleveland, Ohio as a radio and radio parts manufacturer in the early 1920s ( QSL card 8ACH ) .At age 23 he had already received the first of many patents, this one for a high frequency tuning device that could be used in systems with radio frequency amplifiers of constant frequency.He had started a radio parts business and became interested in designing and building high quality radio receivers, some of which still exist today.