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Tel: 0429683104 

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The first of its kind, and inspired by instruments not seen for over half a century, the ‘Duplex was once popular in America, with many pieces written specifically for it during the early 20th century.

The ‘Duplex’ has two bells; one similar to a regular Euphonium, and the second providing a Trombone-like tone. A particularly versatile instrument, the ‘Duplex’ is ideally suited for both playing solos, and covering multiple parts.

The switch between bells is made by the use of a 5th valve, whilst the second bell is removable, enabling it to be played as Euphonium when desired.


  • Key: Bb (both bells)
  • Bell: Euphonium 12” (300mm)
  • Trombone 8½” (216mm)
  • Valves: 4 compensated piston valves and bell switch piston valve
  • Bore: valves 1-3 - 0.59” (15mm)
  • 4th valve - 16.8mm (0.66”)
  • Shank: Euphonium large shank
  • Weight: 13lb (5.85kg)


  • New exclusive Wessex design (First ever compensated Duplex)
  • Trombone bell removal and stored inside euphonium bell for transporting
  • Stainless steel valves for reliable operation
  • Vented valves for smooth legato playing
  • Gold brass euphonium bell

Duplex Bb Euphonium

SKU: EP105
  • Please note that pricing is an estimate and will depend on the available exchange rate available and changes in pricing from our supplier.  Contact us for an exact quote.  Note our price will include GST and import duty, which overseas prices will exclude.