Source
Miraphone 186 CC tuba (Music & Arts dealer page)
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Miraphone 186
Tuba · Germany
The Miraphone 186 is a 4/4-size rotary-valve tuba offered in both C (CC) and B-flat (BBb) pitches. One of the most widely used professional rotary tubas, it is frequently cited as a benchmark for tone and intonation in orchestral and concert-band playing, with a roughly 17.75-inch bell.