Petrof P 131 M1 Upright Piano

P 131 M1 upright piano is also part of the highest, master built upright piano series. These are upright pianos with the greatest sound potential and that are therefore favourites of demanding professional pianists. They are suited not only to apartment interiors and music schools, but also piano recitals within an orchestra or in different public stages.

Robust construction from spruce, 5 vertical posts, made in PETROF company.

The solid stable rim supports the tuning stability of the instrument and ensures its total stability. The special constructive modification of soundboard mouldings enable clear and long-lasting tone of upright piano.

Iron plate

PETROF construction, harp shape, agraffe construction, robust, made from grey cast iron in the Czech Republic. Plate working is done in PETROF factory on special CNC machines. Top surface finish is consistent with surfacing of grand piano plates.

Agraffe construction of the iron plate enables exact scale of strings and is the sign of the most advanced upright piano construction.

Hardware fittings

Massive polished brass, lacquered. Made in the Czech Republic.

Hardware fitting are lacquered, corrosion resistant and do not require any maintenance.

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 is highly resistant to atmospheric changes (e.g. humidity). It guarantees high stability of tuning.

Sound board

The soundboard is made from solid spruce wood in PETROF company. It is shaped into wedge block. Its active surface is 1,2222 m2.

PETROF sound boards have to go through a special long term moisture conditioning and care during the whole production process which guarantee their exact and equal moisture content. This process increases its resistance to cracking due to climate changes. Surface treatment with PUR lacquer raises its resistivity against climate changes.

Ribs

The ribs are circular shaped and are made from European spruce wood in PETROF factory. The cross rib is produced from beech wood. The board is enforced by 10 ribs.