Vintage Hitachi KS-1700H Portable Stereo Radio - The First Boombox! Very Rare!: Superb Vintage Hitachi KS-1700H AM/FM Stereo Radio. The First Boombox! Own a piece of history! (See it at the Radio Museum: http://www.radiomuseum.org/r/hitachi_all_transistor_ks_1700hks.html) 17 TransistorsManufactured in 1968. This is a delightfully designed and executed portable stereo radio. It features two detachable speakers which hinge and clip to the back for transportation and detach to allow spacing for proper stereo imaging.