The new Bach Organ in the Thomaskirche “replicates” the one that Bach knew as a youngster in his hometown of Eisenach where his uncle was the City Organist. Built in 1696 – 1707 by Georg Christoph Stertzing to a 60-stop specification drawn by Bach’s uncle for St. George’s Church, the organ is long extinct.

But, because it must have had strongly formative influences on Bach, the replication of it by organ builder Gerald Woehl of Marburg has drawn much interest. Among its many features is tuning to the "choir pitch" of Bach's time, A=465 Hz, as well as a device which lowers the pitch of the entire organ two semitones to baroque chamber pitch, A=415 Hz, for performance with instruments.

The Bach Organ, installed in the year 2000, is situated on the North choir loft, directly opposite the Bach Window. The specifications for the instrument can be downloaded here.