Mingles, Nick is now including a grounding lug on the rear of each chassis to allow the transformers to be grounded. It sounds like the same wiring scheme that you described for the Sonic Euphoria. Nonetheless, I have never encountered the hum problem that you mentioned with any of the three Promitheus TVCs I have owned. (I have owned the Reference Dual-Box rev. 3 EI-core TVC, the Reference C-core TVC, and the Signature Double C-core TVC.) They have all been dead silent in all three of my audio systems where I have experimented with them. This makes me wonder whether Nick has done something to improve on his wiring configuration beyond the addition of the ground lug.
The new Promitheus TVCs that are built around either a single or double C-core transformer improve significantly on bass frequency extension. These TVCs have a much fuller, weightier sound than that of the TVCs built around the rev. 3 EI-core transformer. In addition, the Signature (double C-core) TVC provides uncanny presence, palpability and image saturation. If you get a chance to audition the new top model (i.e., the Signature TVC), I think you will be very pleased.
I agree that the chassis for the Promitheus TVCs could certainly be more attractive. However, the looks have never bothered me much because of the way the dark color of the TVCs has tended to make them disappear in my equipment racks.
The new Promitheus TVCs that are built around either a single or double C-core transformer improve significantly on bass frequency extension. These TVCs have a much fuller, weightier sound than that of the TVCs built around the rev. 3 EI-core transformer. In addition, the Signature (double C-core) TVC provides uncanny presence, palpability and image saturation. If you get a chance to audition the new top model (i.e., the Signature TVC), I think you will be very pleased.
I agree that the chassis for the Promitheus TVCs could certainly be more attractive. However, the looks have never bothered me much because of the way the dark color of the TVCs has tended to make them disappear in my equipment racks.