During the 1960s, the implementation of rhythm machines had evolved into fully solid-state (transistorized) from early electro-mechanical with vacuum tubes, and also size was reduced to desktop size from earlier floor type. In the early 1960s, a home organ manufacturer, Gulbransen (later acquired by Fender) cooperated with an automatic musical equipment manufacturer Seeburg Corporation, and released early compact rhythm machines Rhythm Prince (PRP), although, at that time, these sizes were still as large as small guitar amp head, due to the use of bulky electro-mechanical pattern generators. Then in 1964, Seeburg invented a compact electronic rhythm pattern generator using "diode matrix" ( in 1967), — When this patent was filed in 1964-06-26, also , , and its sound circuits and were filed at the same time. and fully transistorized electronic rhythm machine with pre-programmed patterns, Select-A-Rhythm (SAR1), — rhythm patterns were fully electronically generated by 48-step binary counter using 6-stage flip-flops was released. As a result of its robustness and enough compact size, these rhythm machines were gradually installed on the electronic organ as an accompaniment of organists and finally spread widely.
During the 1960s, the implementation of rhythm machines had evolved into fully solid-state (transistorized) from early electro-mechanical with vacuum tubes, and also size was reduced to desktop size from earlier floor type. In the early 1960s, a home organ manufacturer, Gulbransen (later acquired by Fender) cooperated with an automatic musical equipme:nt manufacturer Seeburg Corporation, and released early compact rhythm machines Rhythm Prince (PRP), although, at that time, these sizes were still as large as small guitar amp head, due to the use of bulky electro-mechanical pattern generators. Then in 1964, Seeburg invented a compact electronic rhythm pattern g:enerator u.sing "diode matrix" ( in 1967), — When this patent was filed in 1964-06-26, also , , and its sound circuits and were filed at the same time. and fully transistorized electronic rhythm machine with pre-programmed patterns, Select-A-Rhythm (SAR1), — rhythm patterns were fully electronically generated by 48-step binary counter using 6-stage flip-flops was released. As a result of its robustness and enough compact size, these rhythm machines were gradually installed on the electronic organ as an accompaniment of organists and finally spread widely.