Johann David Sieber | Michaelerkirche . Wien [Austria]

web JDSie Mic PictureObelix 1_CC BY-SA 3.0 AT crop

Photography by “PictureObelix”
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The Michaelerkirche organ was built in 1714 by Johann David Sieber, consisting of two main separated cases siding the West window and a Rückpositiv located at the middle of the balustrade. Each case has Hauptwerk and Pedal ranks, divided according to the C and C# principle. There is also a Continuo section integrated in the freestanding console, being a special example of its kind.

Already from 1742 to 1743 the organ suffers changes by Gottfried Sonnholz with the repositioning of Rückpositiv behind the two Hauptwerk cases, transforming it into an Hinterwerk. The console is turned into the opposite direction, with the organist looking at the nave, and the action mechanism is deeply changed, producing several problems that lasted until the more recent restoration work done by Jürgen Ahrend.

In 1785 Franz Xaver Christoph changes some parts of the Continuo section and in 1845 Jacob Deutschmann changes some parts of the stoplist in order to bring the instrument into the romantic taste.

During World War I the front pipes were requisitioned and the instrument lost an essential part of its sound. Some years later, in 1920, the pipes were rebuilt in zinc by Ferdinand Molzer and the pedalboard was extended to 20 notes.

In 1972 a partial organ restoration is attempted by Arnulf Klebel, although unsuccessful, building a new Rückpositiv case and intervening in pipework in a damaging way.

In 1986 Jürgen Ahrend restores the instrument globally, reconstructing three wedge bellows, restituting the stoplist to a configuration similar to the original and repositioning the Rückpositiv in its original position. Sieber pipes were marked with the rank number and register name allowing later, during the restoration work, to place all the original registers in their correct position. Currently the organ has 40 stops on three manuals and pedal, of which 32 of them are original ranks.

 

1714 – organ construction
1742-1743 – organ changes by Gottfried Sonnholz
1785 – organ changes by Franz Xaver Christoph
1845 – organ changes by Jacob Deutschmann
1920 – organ repair and changes by Ferdinand Molzer
1972 – partial organ restoration by Arnulf Klebel
1986 – organ restoration by Jürgen Ahrend

 

Rückpositiv Hauptwerk Continuo Pedal
Copula 8’ Bordun 16’ Copula 8’ Principal 16’
Principal 4’ Principal 8’ Flötten 4’ Subbass 16’
Flöten 4’ Bifflöten 8’ Octav 2’ Bordun 16’
Nassat 3’ Piffares 8’ Mixtur III Octava 8’
Octav 2’ Quinta Dena 8’ Tubal 8’
Quint 1 1/2’ Gamba 8’ Octav 4’
Sedecima 1’ Salecinal 8’ Cornett VI
Mixtur V Octava 4’ Bombardt 16’
Fagott 8’ Fugara 4’ Trompetten 8’
Nachthorn 4’
Quinta 3’
Octav 2’
Földtflöte 2’
Quint 1 1/2’
Sedecima 1’
Sesquialtera II
Mixtura VI
Zimbl IV
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