Yamaha YBL421G Bass Trombone Outfit with Case & Mouthpiece


Bb/F Intermediate Model

Large Bore, 9.5 Inch Bell, 1 Rotor Valve.

  • Bore Size: .563"
  • Bell Diameter: 9 1/2"
  • Body Material: Gold Brass
  • Clear Lacquer Finish
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Yamaha's Intermediate model bass trombone features many of the qualities of our top pro models, yet is available at a surprisingly affordable price. It has the same bell and bore size as most pro models, and the bell is gold-brass for a sound both rich and full.


Inner slide

The chrome-plated, nickel-silver, drawn inner slide is very durable and has a quick, sensitive response.

Outer slide

The one-piece, drawn, yellow brass outer slide maintains an accurate diameter throughout its length. This type of construction ensures airtightness, smooth action, and exceptional durability and offers improved response.

Inner slide stockings

Specially designed, one-piece, inner slide stockings guarantee airtight slide construction, and offer smoother slide action and better alignment, even in the extended 6th and 7th positions.

Tubular braces

Long-lasting, nickel-silver tubular braces contribute to the stability of the slide and enhance smooth slide action.

Pressure formed tubing

Perfectly rounded tubing results in less turbulence and a smoother air flow, thus allowing for an excellent scale and reduced resistance.

Laser-fused pluzuma welded bell

A high-energy laser fuses the brass together for a virtually seamless bell which allows continuous even vibrations.

Slide lock

The unique slide lock design on all Yamaha trombones keeps the slide locked in place and keeps it from accidentally falling.


The large, easy-to-hold, nickel-silver bracing guards against possible slide damage if the instrument is dropped and also lessens fatigue while playing.


Yamaha trombones have mouthpipes featuring special acoustic designs allowing for precise intonation and greater blowing control.

Semi-open wrap

The YBL-421G features a semi-open wrap that allows for an open sound and smooth air flow.


YAC BL58 Bass trombone mouthpiece; aids clear articulation and resonance in middle and low registers
YAC BLC-320 Wood trombone case; fits YBL-421G
YAC 1020P Trombone slide cream
YAC BL59 Bass trombone mouthpiece; standard bass trombone mouthpiece for full-bodied sound
YAC BL59-GPR Bass trombone mouthpiece; gold-plated rim through backbore; standard bass trombone mouthpiece for full-bodied sound
YAC BL60 Bass trombone mouthpiece; large-scale design for powerful playing by advanced bass trombonists
YAC BL60B Bass trombone mouthpiece; broad rim and shallow cup for flexibility in all registers and especially good response in low range
YAC YEO Bass trombone mouthpiece; signature series; rich-sounding mouthpiece for the advanced player
YAC 1351 Vinyl mouthpiece pouch; fits all low brass mouthpieces
YAC 1505G Trombone lyre; gold lacquer
YAC 1505N Trombone lyre; nickel-plated
YAC KB510 Trombone stand
YAC MU-SL14S Trombone mute; straight; aluminum
YAC MU-SL16S Trombone mute; aluminum with copper base
YAC 080000 Yellow rotor string; 2 meters
YAC 1002P Rotor oil
YAC 1021P Trombone slide oil
YAC 1011P Slide grease
YAC 1012P Premium rotor oil
YAC 1013P Rotor spindle oil
YAC 1014P Lever oil
YAC 1060 Lacquer polish
YAC 1078P Vinyl coated flexible cleaning rod; large
YAC 1084P Brass mouthpiece brush
YAC 1090P Untreated polish cloth; large
YAC 1100 Chamois-like polishing cloth
YAC 1665P Trombone cleaning rod
YAC 1670P Spray bottle
YAC 1035P Maintenance kit; trombone; slide cream
YAC 1036P Maintenance kit; trombone; liquid cream
YAC EV-21 Don Knaub, "Steps to Excellence"; trombone
SB59C Trombone Silent Brass system
PM-5 Silent Brass mute only


Level Intermediate Bass
Key of Bb / F
Bore LL: 0.563"
Bell Diameter 9 1/2"
Shank Large
Leadpipe Gold Brass; Fixed
Body Material Yellow Brass
Bell Material Gold Brass; Pluzuma Welded
Weight Standard
Finish Clear Lacquer
Inner Slide Chrome-plated nickel silver; Drawn
Outer Slide Brass; Drawn; One-piece
Mouthpiece 58
Features F-attachment
Pistons/Rotors Single rotor; Hand lapped; Mechanical linkage
Options N/A

Additional information

Dimensions 0.00 × 0.00 × 0.00 cm