The ‘Hellertion’ and The ‘Heliophon’. Bruno Helberger & Peter Lertes, Germany, 1929-1936

The Hellertion
The Hellertion

The Hellertion (1929)

The Hellertion, christened after the combination of the inventor’s names, was a monophonic vacuum tube instrument developed collaboratively by Peter Lertes, an electrical engineer in Leipzig and Bruno Helberger from Frankfurt, a well-known pianist of his time. Several variants of the instrument were constructed with the assistance of Schneider-Opel in Frankfurt, Germany the last of which was known as the Heliophon.
Bruno Hellberger at the Hellertion
Bruno Helberger at the Hellertion attached to a grand piano
The Hellertion was the first electronic instruments to use a fingerboard/continuous controller instead of a keyboard manual and was much copied in other later instrument designs such as the Trautonium and the Sonar. The fingerboard was a flat metal resistance strip covered in leather which when pressed completed a circuit. Depending on where the strip is pressed, a different resistance in the circuit is created altering the voltage sent to the oscillator and thereby producing different pitches. The force of the pressure controlled the volume of the output signal. The fingerboard was marked to help the performer find the correct pitch on the strip and had a range of approximately five octaves.
The wire manual of the Hellertion with an added key reference guide. (image; Radio Wien. 1932)
(image; Radio Wien. 1932)
The original instrument had just one fingerboard strip which was gradually increased to four and then on the later models, six aligned in parallel horizontally at the height of a piano keyboard. The four and six strip models allowed four and six voice polyphony when the strip could be played simultaneously with fingers and thumbs. The Hellertion was occasionally used in concerts as a piano addition, the melody being played with one hand on the Hellertion and the accompaniment being played with the other hand on the piano. A version of the Hellertion was produced in 1931 microtonally tuned to 10 divisions of an octave.
Diagram showing the sliding control of the Hellertion.
Diagram showing the sliding control of an early model of the Hellertion.
Peter Lertes’ book on Electronic Music “Elektrische Musik. Eine gemeinverständliche Darstellung ihrer Grundlagen, des heutigen Standes der Technik und ihrer Zukunftsmöglichkeiten, etc” Theodor-Steinkopff-Verlag 1933

Patent documents of the Hellertion


The Heliophon (1936)

Bruno Helberger's 'Heliophon'
Bruno Helberger’s ‘Heliophon’
development of the Hellertion by Bruno Helberger. The first version of the Heliophon was completed in Berlin, 1936 but destroyed during WW2. Helberger continued the development after the war and built a second model in 1947 in Vienna, Austria and continued the development of the Heliophon until his death in Vienna in 1951 (subsequent development was taken over by Wolfgang Wehrmann). The sound of Heliophon was produced, as with the Hellertion, by heterodyning vacuum tube oscillators but with the Heliophon the sound was controlled by two 58 note pressure sensitive keyboard manuals instead of a series of fingerboard strips. Each keyboard had the ability to be split into three different pitches and timbres simultaneously, the output volume being controlled by foot pedals with a knee lever to add vibrato. Each keyboard had a Hellertion style fingerboard to add glissando and timbre variations. The Heliophon was used by Helberger throughout the 1940s and ’50s for theatrical and musical productions, the instrument was said not only to be capable of producing realistic imitations of orchestral instruments but able to imitate human vocal sounds.
Helberger’s patent documents for the Heliophon
Bruno Helberger and the Hellertion as a Grand Piano attachment.
Bruno Helberger and the Hellertion as a Grand Piano attachment.


A survey of ‘modern’ electronic instruments was published by Peter Lertes in 1933: “Elektrische Musik:ein gemeinverständliche Darstellung ihrer Grundlagen, des heutigen Standes der Technik und ihre Zukunftsmöglickkeiten” (Dresden & Leipzig, 1933)J.Marx:”Heliophon, ein neues Musikinstrument”, Ömz,ii(1947),314

 “Das Hellertion, ein neues electrisches Musikinstrument,” Funkbastler, July 3, (1931).

“The Invisible Weapon : Telecommunications and International Politics, 1851 …”
By Daniel R. Headrick Professor of History Roosevelt University

‘Electronic and Experimental Music: Pioneers in Technology and Composition’
By Thomas B. Holmes, Thom Holmes

Peter Donhauser: “Elektrische Klangmaschinen”, Böhlau Verlag, 360 S., ISBN 978-3-205-77593-5

‘Radio Wien’ 1932 ‘Elektrische Musik’

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