Hagmann free-flow valve.

The Bach 42A Stradivarius Tenor Trombone with Hagmann Valve is a great choice for the player looking for a less resistant F attachment. It features the Rene Hagmann Free-Flow™ valve which eliminates the back pressure that occurs in the F attachment with traditional rotor systems. The 42A offers an open response in all registers, with it's 8.5-inch one-piece hand-hammered bell, .547-inch bore with an open wrap F attachment. It includes a deluxe case and mouthpiece.

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Bach 42A Stradivarius Trombone with Hagmann Valve Specifications:

• Key: Bb/F
• Bore: .547"
• Leadpipe: Fixed
• Leadpipe Material: Yellow Brass
• Bell: 8.5" one-piece hand-hammere
• Bell Material: Yellow Brass or Gold Brass
• Handslide: Standard or Lightweight
• Handslide Material: Yellow Brass or Nickel Silver (Lightweight)
• Handslide Crook Material: Yellow Brass or Nickel Silver (Lightweight)
• F Attachment Wrap: Open
• F Attachment Valve: Hagmann
• Case: zippered Cordura covered wood shell case
• Mouthpiece: Bach 6-1/2A
• Mouthpiece Shank: Large
• Finish: Lacquer