The three main collections of original fortepianos:
A nice video with one of my customers:
www.mattbengtson.com/dossier-fortepiano.html
A great source of information:
A review by Cramer of the 4th collection of pieces for 'Kenner und Liebhaber' by C Ph E Bach (Cramer's Magazin der Musik 1783, page 1254), a report of a visit by Archduke Rudolf to Conrad Graf’s establishment ( Allgemeine Musikalische Zeitung of october 1824), a review of the concerts given by Kalkbrenner and Moschelez in Vienna, 1824 (Wiener Allgemeine Musikalische Zeitung 1824, nrs 3 and 5), the discovery of an original 1787 Taskin fortepiano by Paul de Wit in 1890 (Zeitschrift fur Instrumentenbau of 1 march 1890), this, and much more is here:
http://de.wikisource.org/wiki/Zeitschriften_(Musik)
Some favourite recordings with my instruments:
