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This is a unique clarinet. It is a faithful reproduction of a Baroque C clarinet, probably made by Jakob Denner, son of Johann Christoph Denner, in the early part of the 18th Century. Denner is credited with developing the clarinet from the chalumeau by widening the bore, providing a bell, and enabling the instrument to overblow: All features of this clarinet.
This instrument was made for Alan Hacker by Brian Ackerman in the 1970's, and this instrument can quite rightly be seen as the start of a reproduction industry which went on to stimulate a revival of interest and an era of period instrument performance. The clarinet has 2 brass keys, is in boxwood and has five main pieces. The reed, a modern soprano sax reed can be cut down to fit, is attached to the mouthpiece by string. The approximate length is 60cm and the instrument plays in the key of C. The bore is cylindrical, apart from the bell, and measures 14.75mm. A is approximately 423Hz. This instrument was used by Alan Hacker for a recording of Vivaldi's Concerto in C for 2 Oboes and 2 Clarinets.