In 1736 he was in Maastricht, but by 1738 he had moved with his wife Susanna Maria Knopffell and their son to Antwerp where they became members of the Reformed church.
His will left all his harpsichord-making material to his son Joannes Dulcken; he died in Antwerp.
He left a good reputation behind: Charles Burney claimed that, after the Ruckers family, 'the harpsichord-maker of the greatest eminence … was J. D. Dulcken'.
He made single and double manual harpsichords, generally with a compass of five octaves (sometimes slightly less) and the common three registers; two 8' and one 4'.
He went into the family business and by 1781 was employed as 'Mechanischer Hofklaviermacher' in Munich, where he remained for the rest of his life; he is last mentioned in 1835.