VEB Weltmeister TO 10 Transistor Combo Organ

The Weltmeister TO 10 is a 3-course transistor organ with a keyboard of 47 keys, 17 of which are monophonic bass keys. 32 keys are polyphonic 2-course 8' - 4'. Slide registers are used for vibrato on/off, balance, bass/treble and volume. 
Electric and electronic organs have been built since 1959 in the VEB (Volkseigener Betrieb) in Klingenthal / GDR under the names Weltmeister, Böhm and Vermona (1972). The first organ, the EMP Ionica, still used tube-based sound generation. The Weltmeister series came onto the market at the end of the 1960s. The TO 10, which appeared at the same time as the TO 200/5, was the basic model of a modular system for students, but was not expanded. 
(Source: Vermona-DDR)