TW Electronics 1958 - 2000
The nuvistor preamplifiers also used the RCA 6CW4 miniature nuvistor (as used in the converters) which had a very good low noise performance.
I have managed to obtain one of these rather rare units (according to Tom not many were built for the amateur market). This particular unit appears to be for 2m and has its own built in power supply.
No information currently available.