Neutron spin echo (NSE) spectroscopy is, due to its high energy resolution, a well-suited method for studying slow dynamics, such as the dynamics of soft matter systems (glasses, polymers and complex liquids), or paramagnetic properties of, e.g., spin glasses. The Jülich NSE spectrometer has been in operation at the Jülich research reactor FRJ-2 since 1996. It has been transferred now to the new research reactor FRM II of the TU München, where it just started to continue operation. In the context of the transfer, parts of the spectrometer have been renewed and improved, leading to a significantly larger energy resolution and a larger dynamic range. Amongst other things, new correction coils have been designed and manufactured, allowing us to use higher currents in the main precession coils. The neutron guide system of the J-NSE allows the variation of the wavelength between about 4.5 to 16 Å. A larger neutron guide exit of 60 × 60 mm2, the higher neutron flux, the possibility of varying the wavelength over a broad range and the better correction elements push the performance of the instrument to Fourier times τ = 1 ps to about 350 ns, with a q-range of q = 0.02–1.5 Å−1. We describe here the technical changes and improvements of the J-NSE and show the first spin echoes measured with the reinstalled spectrometer.