File:P Kolbe-04 3CH-Austria 01.jpg

English: The picture shows two Ampex 350 3-channel tape recorders, the first of which Hellmuth Kolbe claims to have received in 1953, and in the foreground most possibly a portable audio “processor” with XLR connectors at its backside, probably an American military style mixing console. This equipment could have been installed either in RWR premises, in a Viennese Concert House, or in the Wiener Musikverein. The picture actually is from a series of recordings for CBS in 1964, with American tenor Richard Tucker (1913-1975, left), conductor Pierre Dervaux (1917-1992, middle) and apparently Tucker’s wife Sarah (?–1975, right) in the Vienna Concert House (Orchestra: The Vienna State Opera Orchestra).