Hi everybody,
Allow me to paraphrase an article of "Mahler in Amsterdam, from Mengelberg to Chailly" regarding a huge tympani. During his Mahler campaign, Mengelberg felt the need for a bigger sized tympani, one that would not only go deeper, but also louder. Communications with Vienna based company Hans Schnellar didn't yield anything. About 1919 Mengelberg inquired at Amsterdam based van der Hoek, who promised him to look into this as they had already gained some experience. On January 12th van der Hoek proudly announced the realization of a 41 inch tympani, with 110.5cm's skin diameter. For comparison, by 1993 the RCO's biggest tympani was "only" 29 inches. Mengelberg and assistant Dopper were happy and the board offered a sum of 500 guilders for expenses for the build and for the usage by RCO. After a short while the instrument became disused and was moved to the attic of the Concertgebouw. A restructuring of the attic which included the installation of smaller doors made it stay in its place until the recent restoration. The tympani was moved downstairs and sold. Marinus Komst, tympanist and grandson of the famous solo trumpet of the RCO bought it off an instrument collector. The kettle had suffered from dents and tears, the "undercarriage" was severely affected by rust, and mice had lived in it. Also, the top was not completely straight, because van den Hoek at that time did not have the precision measuring instruments. This may have been the reason why the instrument didn't get used often from the start. Komst had the tympani restored at Goldsteen in Vught, so that it could be used again in April 1994 in Mahler's 7th after many many years. The restoration also made for a well sounding A in the counteroctave, which Mengelberg had been looking for in the first place.
Best regards,
Phaedrus