Restoration of the Gebauhr Grand

C. J. Gebauhr in Königsberg Pr.

Grand piano, ca. 1850-1860, length ca. 2.00 m

Restoration by Klinkenberg Pianoforte GmbH for a private collection of historic keyboard instruments in a castle in central Germany.

The restored Gebauhr grand: case, stringing, historic material character and colour-matched details.

1. Preliminary note

With this report we document the restoration of this C. J. Gebauhr grand piano from Königsberg. The instrument will enter a private collection of historic keyboard instruments in a castle in central Germany; the work therefore had to succeed not only technically, but also restore the instrument’s dignity, its historical eloquence and its musical voice.

The Gebauhr arrived at our workshop in an exceptionally difficult condition. Many of the faults could not be remedied with a single measure; they required a long sequence of small, careful decisions. This restoration was therefore not a mere “repair”, but a cautious recovery: of substance, of surface, of inner stability, of touch and of tonal character.

It matters to us that instruments of this kind are worked on by people who do not treat the task as paid labour alone. Historic grands demand inner involvement. One must be able to read material, construction, sound and ageing. One must hear when a note carries again, and see when a surface has regained enough depth without looking artificially new. This work is done with craft, experience, patience — and with heart.

2. Brief profile

Instrument
C. J. Gebauhr in Königsberg Pr., grand piano

Dating
ca. 1850-1860, provisionally from construction, lettering and material character

Length
ca. 2.00 m

Pitch
435 Hz

Client
Private collection of historic keyboard instruments, castle in central Germany

Scope of work
Structure, soundboard/ribs/frame, body, veneer/surface, wrest-plank appearance, stringing, pin appearance, action, damping, keyboard, logo reconstruction, regulation and voicing

Working time
ca. 480 team working hours

External specialist work
Hammer heads: Alexander Abel, Stuttgart; lacquer/cast-iron work: Bernd Döffinger, Stuttgart; lid glueing: cabinetmaker Volker Lück, Karlsruhe

3. The people behind the work

Most of the work was carried out by the team of Klinkenberg Pianoforte GmbH. Individual specialist tasks were deliberately given to selected craftsmen when their particular experience promised the best solution for a given detail. The result is not an anonymous restoration, but a joint work of several specialists.

With a historic grand of this kind it is not enough to work by a scheme. Every decision affects the whole: stability, surface, touch and sound. That is why human involvement mattered so much. The work on this instrument required calm hands, endurance, a sense of sound and the willingness to engage with the particular character of the Gebauhr.

The staff and craftsmen involved did not merely execute; they thought with the work, compared, corrected, started again and discussed details. The result therefore bears traces of craftsmanlike precision as well as musical sympathy.

Staff/craftsmen at work on the Gebauhr

Detail work on action, surface or stringing

4. Restorative aims

The aim was a restoratively responsible reconstruction: to preserve as much historic substance as possible, to stabilise the construction and to make the instrument playable again as a convincing, reliable grand.

The work was deliberately not understood as a smooth modernisation. The instrument’s particularities — the material hierarchy of the woods, the simpler rear and left sides, the damper tops left white, and the limited regulation of the action — were not removed, but documented and respected as historic characteristics.

5. Image metadata and time frame

In the existing photographic documentation, 217 relevant image files were recorded. 99 files contain readable EXIF data; 52 carry a date in the filename. From the files a photographic start no later than 22.09.2024 is securely attested. Individual Apple files carry older EXIF data from 05.06.2023; these should be treated cautiously as older detail or starting photographs, not automatically as the beginning of the restoration.

The densely documented working phases lie in June, July and August 2025; further dated action and damping photographs are from 22.04.2026. The frame mid-2024 to mid-2026 is therefore a well-justified project frame; from the image data alone one may state conservatorially: photographically documented at the latest since autumn 2024.

6. Historical and material placing

Carl Julius Gebauhr belongs among the important Königsberg piano makers of the 19th century. The present instrument shows a representative, yet economically differentiated furniture design: lid of solid mahogany, body and visible inner rim with pyramid mahogany, inner fallboard with rosewood.

Characteristic is the deliberate material hierarchy. The most valuable and lively veneer lies on the most strongly visible areas; less exposed sides are more simply executed. This observation is not a defect, but a historically interesting finding.

Deviations too — missing or simplified carved ornament on the left side, damper tops not painted black — were not subsequently “corrected”, but respected as part of the instrument.

7. Condition as found and structure

Soundboard, ribs and parts of the inner-frame construction had come loose. On the bass side or on the body a wide crack ran almost the full length. This crack was closed slowly, glued, filled and retouched. On the evidence this was the most elegant and stable solution, because it preserves substance and at the same time makes the construction load-bearing again.

The wrest plank was technically sound. It was not replaced from structural necessity, but veneered for visual reasons, because the visible surface was badly disfigured. Technical substance was thus preserved, while the visible effect inside the instrument was calmed.

8. Case, veneer, shellac and colour matching

The veneer was badly faded and restless in effect. The various woods showed clear colour differences: some areas appeared more reddish, others more brown. These differences were not covered over, but carefully evened, so that the material effect appears coherent while the natural variety of the woods remains visible.

All case parts were polished with shellac. The polish was to give the instrument depth, light and calm again, without making the surface appear “new”. Especially on a historic grand, shellac is not merely an aesthetic choice, but part of an appropriate culture of material and sound: the surface should be able to breathe, to age, and to show its handmade origin.

In an early working step the veneer was slowly and carefully retouched with the brush. The aim was to recover the veneer image: the dark places were to regain depth without producing an artificially even surface. The lid was present in two parts and was glued several times, because the joint did not hold at first owing to warped wood. This specialist work was given to cabinetmaker Volker Lück, Karlsruhe; lacquering and the painting of the cast-iron/metal parts were carried out by Bernd Döffinger, Stuttgart.

9. Stringing, pins and cast-iron/metal parts

The new stringing follows the historic model. The pins are technically modern pins; the visible heads, however, were individually filed and browned with gun oil. Reliable modern function is thus combined with historically plausible appearance.

The colour of the plate and of the iron parts was determined at protected places where the original lacquer had been less exposed to light. This method is more appropriate than a free choice of a new colour and helps the instrument remain credible in its overall appearance.

10. Keyboard, action and damping

The key coverings had to be taken off almost completely. Part of the original coverings was reused; about half were replaced in a matching colour. Each plate was worked individually so that no disturbing joint remains visible between front and rear plates.

Action and damping parts of felt, leather and cloth were no longer usable because of hardening and moth damage. The garnishing felts were ordered in matching colour from Hainsworth in England, of pure wool. For the colour, a place was used where the original felt had not been exposed to light.

The hammer heads were made by Alexander Abel in Stuttgart from samples sent to him. The simple action offers few regulation possibilities; the effort therefore lay especially in patient, small-scale regulation, in order nevertheless to achieve an even and reliable touch.

11. Logo, regulation and voicing

The logo on the soundboard was photographed, graphically reworked and completed. It was then applied again at the same place and in original size in the workshop as a screen print.

The final voicing aimed at a warm, transparent-clear, romantic tone with a full bass at the same time. Tuning to 435 Hz supports this historic idea of sound and reduces the structural tension compared with a modern concert standard.

The tonal work was not only a technical conclusion, but an essential part of the restoration. An instrument of this period need not sound like a modern concert grand; it needs its own speech, its own breath and its own relation of bass, middle and treble. This balance was sought carefully.

12. Result and personal appreciation

The Gebauhr grand was not only restored outwardly. It was stabilised, made readable in its historic character, and recovered musically. The restoration joins conservative restraint with practical playability: load-bearing original substance was preserved, worn parts were replaced where necessary for function and sound, and new interventions were carried out so that they subordinate themselves to the instrument.

For this collection, the grand is therefore not merely a further object. It speaks of Königsberg, of a particular 19th-century way of building, of economy of material and craftsmanlike ambition — and now also of the labour of bringing it back into a dignified, sounding form.

Instruments of this kind need clients who see not only market value, but take the cultural and musical meaning of a historic grand seriously.

13. Notes on the photographic documentation

The original version of the report contained extensive photographic documentation with numbered plates. In this newly written text version, placeholders for staff and working photographs were provided. The existing instrument photographs from the previous documentation can be inserted again at the corresponding places: condition as found, case/veneer/surface, stringing, action/damping, logo and restored overall view.

Recommended image selection for the final version:

• Title photograph: restored Gebauhr grand, view into case and stringing
• Condition as found: soundboard, ribs, inner frame and cracking
• Case/veneer: retouch, shellac polish and colour matching of the wood areas
• Stringing and pins: browned pin heads and colour-painted cast-iron/metal parts
• Keyboard/action: key coverings, garnishings, hammer heads and damping
• Logo reconstruction and finished interior
• Staff/craftsmen at work: the personal dimension of the restoration

14. Sources and comparative material

• Dieter Gocht, „Gebauhr, Carl Julius – Pianofabrik in Königsberg, 1834–1913“
• Early Pianos, Maker Profile: Gebauhr, Carl Julius, senior
• Philharmonie de Paris, „Piano à queue – C. J. Gebauhr in Königsberg Pr.“
• Musiał, „Renowacja fortepianu C. J. Gebauhr in Konigsberg“
• Kunsthistorisches Museum Wien, „The Restoration of the Fortepiano by Nannette Streicher“
• CeROArt, „La restauration du piano de Grétry“
• PTG, Watson/Eschete, „The Restorative Conservation of Historic Pianos“