Küch was born on March 18th, 1837 in Höhnebach. He seems to have worked in every possible theatrical job. He made his debut in 1865 in Gera. During the next 25 years, Küch had ups and downs in 21 cities. He was the first Lohengrin in Chemnitz (1870), Stolzing in Düsseldorf (1878) and Magdeburg (1880). He was longer than one year in Kassel, Göttingen, and Magdeburg. He also sang in Freiburg, Altenburg and then Ulm in 1889. In 1890, Küch was director, producer and singer of an opera troupe in Neisse (today Polish Nysa). In 1890, he retired to Friedrichroda. Küch died on December 6th, 1899 in Halberstadt.
Reference: Einhard Luther, So viel der Helden. Biographie eines Stimmfaches, Teil 3: Wagnertenöre der Kaiserzeit (1871–1918), Berlin 2006 (where he is called Conrad Küch, which is however wrong)