P 135 K1

The exceptional heritage of our ancestors

Meet the tallest upright of the PETROF brand, which boasts the greatest sound potential. Its size makes it ideal for discerning professional pianists and audiences. This is an instrument of masterly construction intended for music schools, (home?) interiors, and for the performance of musical works with orchestra. Its uniqueness is enhanced by the unusual design of the music stand, but lies most of all in its powerful, open and colourful tone.

upright piano ground view

  • Depth - 606 mm | 23,86"
  • Height - 1350 mm | 52,76"
  • Width - 1448 mm | 57,01"
  • Weight - 256 kg | 564 lb


Black, high polish (0801)
* Other finishes per order
  • Technical specification
    Length (mm)   606
    Width (mm)1448
    Height (mm)1340
    Weight (kg)256
    Sound board materialResonance spruce wood
    Active area (m²)1,2222
    Ribs (number, shape)10, spherical
    Soundboard constructionwedgewise tapered, 9 mm in upper section - 7 mm in lower section
    Cast iron plateWet sand casting
    Surfacing of iron platelight gold metallic paint, diamond effect
    Pin block - materialMultiplex beech plywood, density 800 - 850 kg/m3
    Inner rim material-
    Inner rim thickness-
    Wooden frame postsspruce wood, 3+2 posts
    Descant post material-
    Cut off bar (corner cross rib)Steel-round tips
    Outer rim - material-
    Bridge - treblebeech wood
    Bridge - bassbeech wood
    Bridge pinsocel - zabroušené špičky
    Agraffes material - numberbrass, 88
    Duplexes - front-
    Duplexes - rear-
    Strings - materialsteel wire Röslau Germany, copper winding Degen Germany
    Hitching of plain stringsdouble
    Dampers - number1 - 70
    Hammer headsRenner
    Keys balancing, touch weight52g in bass - 48g in treble
    Black keysAcrylate plastic
    Pedalsleft - Piano pedal, midle - Muffler (moderator) pedal, right - Forte pedal
    PETROF sign on right side wall-
    Felts colourred
    Hydraulic slow close fallboard mech.yes