Shunyata research told me that the Hydra HC VTX power cable is not a direct replacement for the black mamba, but I was also told that this cable is preffered over the black mamba. The new VTX geometry was developed with the DTCD test device. These new geometries are suppose to be the best incarnation of the Shunyata line. The Hydra HC PC is lower cost than the black mamba because it doesn't have the fancy wrappings. While the Hydra HC is certainly perfect for the Hydra units themselves, I was also told the Hydra HC VTX is great on amps. Remember - the VTX geometry replaces the older CX geometry.