Advantages of the construction and materials used in the PETROF V grand piano
Rim
PETROF V grand piano
Petrof original.
Inner frame is laminated from 9 layers of solid beech and birch lamels.
Outer rim is laminated sandwich with solid alder wood core and outer birch plywood lamels.
Total thickness of side wall of piano is 5,8 mm.
The rim is produced with highest exactness at "CNC machine".
The solid construction of the rim of P V grand piano ensures high and longterm tuning stability and action regulation as well as sound board crown stability which is a prerequisite for perfect performance.
Frame posts
The rim is reinforced by 3 masive spruce posts.
The connections are provided by fish-tail and beech dowels.
The frame posts are produced with high exactness at "CNC machine".
The frame posts provide a high contour stability of the frame, tuning and regulation stability.
Legs
Petrof original.
Solid beech core, solid alder outer lining, gabon counter veneer, outer decorative thin veneer.
The robust construction of the legs ensures high stability of the instrument whilst being played.
Iron plate
Czech producer.
Gray cast iron, hand worked surface, drilled at "CNC machine", lacquered.
Precise drilling means exact length of strings and creates good conditions for their optimal oscillation and creation of an exact tone.
Hardware fittings
Petrof original.
Solid brass, polished, lacquered.
Hardware fittings are corrosion resistant, therefore they do not require any maintanance. It is fully comparable to fittings used in the world´s finest grand pianos.
Pinblock
Special beech plywood type Multiplex.
Original veneer thickness 2 mm compressed to the density 800 - 850 kg/m3 (= 6 veneer layers/cm).
High moisture resistant glue.
The pinblock in this grand pianos has a high resistance against atmospheric changes (e.g. humidity). It provides equal torque of tuning pins, which results in a particularly high tuning stability.
Soundboard
Petrof original.
The soundboard is made from European spruce. It has a symmetric crown and is shaped into wedge block. Thickness 9 mm in front, tapered to 7 mm in bass arc.
Traditionally shaped sound board gives high acoustic performance in all frequencies of the whole range. Its construction greatly contributes to generating the typical tone of PETROF grand pianos.
Ribs
Petrof original.
The ribs are made from European spruce and are symetrically circular shaped. The ends are machine lightened.
Traditionally shaped, very exactly worked ribs from European spruce supports a symmetric crown of the sound board.
Bridges
Petrof original.
Treble - solid beech, hornbeam cap in top descant.
Bass - solid beech with a foot bridge.
Bridges are blackened by black PUR finish. Hand bored and maschine notched.
The construction of the bridges and materials are comparable in quality with the high class of standard grand piano bridges. The hornbeam cap of treble bridge supports better transmission of high frequencies onto the sound board. The foot bridge of bass bridge enables an oscillation with bigger amplitude, it improves its sound ability.
The construction and materials used in the P V grand piano support the creation of typical tone of PETROF instruments and give sufficient acoustic performance to the grand piano.
Scale
Agraffes. Double hitch pinning of treble strings.
Traditional construction of agraffes is fully comparable to the finest brands of grand pianos.
Tuning pins
Steel, nickeled.
The tuning pins are of the highest quality, corrosion resistant and fully comparable to the best marks of grand pianos.
Strings
Steel wire Mapes USA, Röslau Germany.
Copper winding Degen Germany.
Longest string 1150 mm.
Strings used in the P V grand piano are made from string wire of the world´s finest quality.
Hammer heads
Abel Germany, walnut or hornbeam mouldings.
Abel Premium under felt and top felt.
Hammer heads Abel, which are fitted in this grand piano, are some of the best worldwide. They enable the player to get a great variety of tones.
Dampers
Petrof, hornbeam heads.
Felt Laoureux France.
The felt, manufactured by French company Laoureux, is a guarantee of the highest quality proven by generations.
Action
Petrof original action.
Wippen rail aluminium.
Hammer rail aluminium.
Hornbeam action parts and hammer shanks.
The PETROF action is quick and with good repetition. Specifically profiled aluminium action rails are very stable also in changing humidity. The action enables the P IV grand piano to be played confidently, even technically demanding passages, and to have full control of creating tones.
Keys
Petrof original.
The keys are from European spruce. White and black acrylic tops - Polyplex Sweden.
Individually balanced keys.
The P V grand piano has keys of European origin, each key is individually balanced. The quality is proven by more than 140 years of production tradition.
Key bed
Petrof original.
Spruce sandwich board, beech veneered.
Solid beech insert in lyre and legs zone.
Thickness 47 mm.
The key bed is reinforced by bulky beech rail from below.
Robust key bed of the P V grand piano is of the same construction as in master concert instruments. It ensures regulation stability of this grand piano´s action as well as stability of the whole instrument. It provides a certitude to a playing pianist.
Pedals
3 pedals, solid brass.
Middle pedal has function of prolongement.
The construction, materials and fuction of P V´s pedals are comparable in quality with the highest class pianos´ pedal mechanisms.
