TVC Promethius versus Bent


Any impressions on differences from this that have tried TVCs from both these companies? Also, I'm not sure why a transformer would help over of a passive resistor based attenuator (assuming a very high quality pot)assuming drive, low output impedance source, low capacitance cables, high sensitivity amp with high input impedance (100kohm). If more is less, why isn't adding a transformer just more, though minimal, distortion? Sort of two questions, but I have a high quality passive volume control, but have an interest in the TVC idea, especially these two brands or something made by Kevin Carter.
pubul57

Showing 2 responses by mingles

The first gen Promitheus that I owned couldn't be beat for $300. It had all the transparency and detail you could ask for, but the bottom end was lacking compared to a Sonic Euphoria and a Bent TVC. The Promitheus also suffered from ground issues. It has a common ground for all the inputs and outputs. I got hum if any of the inputs weren't connected to a component. Maybe Nick has fixed this with newer versions, but it was a significant problem for me. The Sonic Euphoria has an identical wiring scheme (common ground bus), but it has a wire that can be connected to an outlet to stem the problem. It still has a little hum, but not as bad as the Promitheus. The Bent, on the other hand, is dead silent when it comes to grounding issues. There are two things different about its design. The inputs don't share a common ground -- hot and ground are independently switched through the source selector. There's also a switch that lets you toggle between floating and grounding the output to the source. All in all, the Bent is very well designed and sounds superb. John Chapman is one of the most helpful and courteous fellows I've ever dealt with.

I haven't heard Nick's new C-core TVC, but I've read that it's a big improvement. I only wish he would redesign the chassis. It's one of the most unattractive cases I've ever seen. I affectionately called it the Duckling.
Pubul57, thanks for the news. A lot of people have been waiting for this unit. How is the warmth factor? Particularly in the mid bass? Have you done a back-to-back comparison with an active?