Source
Yamaha YBB-641 (Brass & Winds dealer page)
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Yamaha YBB-641
Tuba · Japan
The Yamaha YBB-641 is a 4/4-size professional B-flat (BBb) tuba with four rotary valves. Built for orchestral and concert-band use, it is known for a warm, dark tone and reliable intonation, with a 16.5-inch upright yellow brass bell and a gold-brass leadpipe.