Rath R4F Tenor Trombone - Hagmann ValveThe medium large bore R3 trombone and the large bore R4 are available with an F valve section with the designation of R3F and R4F. Michael Rath also offers the R4 and R4F models with "in slide" tuning, Two valve choices are available, both Swiss designed: the Ren Hagmann valve or the Willson Rotax valve. The Hagmann is free flowing and well balanced between open and closed operation. The Rotax has a more traditional feel, offering a little more
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