VEB Vermona E-Piano Analog Piano

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The polyphonic Vermona E-Piano is an electronic transistor instrument, equipped with a keyboard of 61 keys from F - f‘’‘’ and playable over 6 octaves. This instrument and the simultaneous Strings Piano complemented the range of organs that had been on the market since the early 1970s. 

The electric piano has infinitely variable adjustment of the tone colours piano, spinet, clavichord and their mixtures, adjustable tremolo frequency and amplitude, as well as sustain long. Integrated circuits generate a frequency over one octave via a generator (700 kHz), the frequency division provides tone frequency voltages in the range of 6 octaves. On each key, square wave signals with a duty cycle of 1 : 7 or 1 : 3 are generated by a combination of three or two tones and a downstream transistor. An envelope circuit, which triggers percussion and sustain, controls the transistor, while a bass tone generator controls frequency and amplitude. (Source: Service manual)