Hieronymus Albrecht Hass

The latest known instruments by him are two unfretted clavichords, dated 1744; a Clavicimbel for Duke Friedrich Carl von Plön was delivered the same year.

Later, in 1773, English music historian Charles Burney noted 'Hasse, father and son, both dead' as German organ builders, and that 'their Flügel and Claviere are much sought after'.

This instrument was owned by Rafael Puyana; a copy was made by Robert Goble & Son and used by Trevor Pinnock in Poulenc's Concert champêtre.

[2] Raymond Russell wrote of Hass and his son that the 'extent and quality of their surviving work must place them first in German instrument making.'

Hubbard (1965, 191) held a very mixed view: "The Hass instruments, superb technical achievements, strike us as the grotesque result of the barbarous imposition of tonal concepts appropriate to the organ on the unresisting but equally unresponsive harpsichord."