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This site introduces unknown Emanuel Bach (C. P. E. Bach).
C.P.E. Bachʼs Clavichord
According to Miklós Spányiʼs CD (BIS-CD-1189), "Information about C.P.E. Bachʼs clavichord is insufficient to establish a precise understanding of his instrument preferences. The instrument Bach cherished for a long time was the legendary clavichord crafted by Gottfried Silbermann. This clavichord remained his beloved instrument until he parted with it in 1781. Numerous 18th-century writers praised and mentioned the unique qualities of this clavichord. However, some questions arise. What was the keyboard range of this clavichord? If it is assumed that its range was less than five octaves, it is likely that, after a certain point, this instrument was mainly used for Bachʼs improvisations. Considering that Bach began composing keyboard sonatas with five-octave instruments in mind, it suggests that he was also conscious of more modern instruments beyond Silbermannʼs clavichord. This may explain why he eventually decided to sell his cherished clavichord. This decision indicates that he was sufficiently satisfied with other clavichords as well."
C.P.E. Bachʼs estate inventory lists two clavichords: one made by Christian Ernst Friederici and the other by Jungkurt. Although nothing is known about the latter maker, Friederici was one of the most renowned clavichord builders in central Germany, inheriting the tradition established by his teacher, Gottfried Silbermann. In his letters, Bach expressed a preference for Friedericiʼs clavichord over North German instruments. He criticized North German instruments for being difficult to play and found the use of 4-foot strings in the bass register "unbearable." In fact, the North German school of clavichord making differed significantly from the instruments crafted by central German makers. On the other hand, the Thuringian and Saxon regions were heavily influenced by Gottfried Silbermann. Especially around Dresden, Silbermannʼs practices were maintained, and excellent instruments continued to be produced for several generations. Therefore, it was natural for Bach to favor instruments from this tradition in addition to Silbermannʼs clavichord.
Some of Friedericiʼs clavichords still survive today, and many similar clavichords made by the Saxon school also remain. One of the greatest makers representing this grand tradition was Gottfried Joseph Horn. Along with his brother Johann Gottlob, his instruments were widely respected and highly praised. The construction of Hornʼs clavichords is very similar to that of Friedericiʼs. One of his most beautiful works is currently housed in the Leipzig Museum of Musical Instruments."