Yamaha TR-6A4a
TrumpetIn Production
Precision Specifications
RIM DIAMETER15.9 mm
CUP DEPTHExtra Shallow
THROAT ∅3.65 mm
BACKBORENarrow
SHANKStandard
CUP SHAPE—
Rim Widththick
Rim Contoursemi-flat
Throat Drill #—
Materialbrass
FinishSilver plated
Weight—
Recommended For
Lead
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Reference Notes
Very shallow cup for easy high notes; lead trumpet staple.12 Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.
Brand Deep Dive
Yamaha · BrassFit Science
Yamaha Mouthpiece Guide
Yamaha mouthpiece numbering, cup families, and instrument-specific selection guide.