12-string Jumbo

The Jumbo Model (GA) is the largest size guitar, with great basses, volume, and projection. Excellent for strumming, and flatpicking.

First in the World luthier acoustic guitar with the following innovations:

  • Acoustic Tubes inside the guitar neck (Patent – European Patent Office no. EP 3340231 ‘Acoustic Tubes’)
  • Top with ‘WAVE’ resonator
  • Back & sides made in High-Tech Press
  • Bridge with drilled holes
  • ‘Sigmoidal Joint’ of the guitar sides
  • Special chemical-ceramic coating of the back & sides inside
  • Special chemical modification of the soundboard

Sample specifications

Body: Jumbo, 12-strings, 12-frets to the body
Double-Top: Alpine Spruce from Tirol (Master Grade) / Old-growth Redwood (Master Grade)(bottom layer)
Back&Sides: Bolivian Rosewood with sapwood (Master Grade)
Neck: Turkowiak asymmetric profile, made of flamed Sycamore Maple (Master Grade), dual-action double truss rod
Fingerboard: Elevated, Ebony (Master Grade), binded, compound radius 16″ (at the nut)
Head: Type: Modern (Open); Plates: Natural Baltic amber; Logo: natural white Baltic amber
Bridge: Ebony with drilled holes (Master Grade), hand-shaped shaped, encrusted with natural bone and Baltic amber
Soundhole: central encrusted with natural Baltic amber
Heel: Cup: Ebony (Master Grade); Logo: Natural Baltic amber
Arm bevel: Smooth, Ebony, integrated with the guitar body
Nut: Hand-shaped and polished bone, 46 mm (1 13/16″) width, semi-scalloped
Saddle: Hand-shaped and polished bone, semi-scalloped
Tuners: Gold plated single tuning keys, with mother of pearl screw reinforcements. Ratio 1:18
Binding: Ebony (Master Grade)
Fingerboard: side dots Natural bone ø 2 mm at 3, 5, 7, 9, 12 (double), 15, 17 frets
Frets: EVO-GOLD (nickel-free)
Strap buttons: Ebony with logo inlays in natural Baltic amber
Scale length: 25.5” (647,7 mm)
Finish: Varnish, highly resonant, anti-static (own recipe), hand-polished, high-gloss
Pickguard: Bolivian Rosewood (Master Grade)

Warranty: Life-time
Hardcase: Highest-quality, brand hardcase

Pin-less bridge with ‘drilled holes’ for increased stiffness of the wings and extreme lightweight


All my steel-string instruments are equipped with the newest generations of the following innovations: