Source
Ludwig timpani parts catalog (Ringer, Grand Symphonic, Professional, Standard, Universal)
Cited by
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Ludwig Grand Symphonic Series Timpani
Timpani · United States
Ludwig's Grand Symphonic Series timpani feature hand-hammered seamless copper bowls in a suspended one-piece construction with a pedal-activated pro tuning gauge, designed for the most demanding orchestral use.
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Ludwig Standard Symphonic Series Timpani
Timpani · United States
Ludwig's Standard Symphonic Series timpani use smooth copper bowls mounted to the struts and the classic Balanced Action Tuning Pedal, with internal tuning mechanisms giving roughly a major-sixth range per drum. One of the most widely used timpani lines worldwide.