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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
rocketiii
24 posts
 
I have the Bent Audio TVC and find that the transparency that this offers is remarkable. It is feeding an Atmasphere S30 Mkiii OTL which works fine as a combination for me as my speakers are very effiecient (Duo's 108 dB/w). I have tried various active pre's including the Atmaspere MP1 and in my view the TVC wins hands-down.

I can recommend the Bent Audio without hesitation (if you can find one now) - they are really well made.

I have to confess that I've not tried the Promitheus but I reckon it would offer very similar performance. Good luck.
clio09
2,978 posts
 
New Bent TAPs are on the way using custom Intact Audio autoformers. According to John he's finishing up the first few production units and then needs a few weeks to stock up on parts.
pubul57 OP
3,712 posts
 
What are the theoretical beneifts/disadvantages between autoformers and transformers?
gmood1
1,251 posts
 
From what I've read,the one advantage of the TVC is that it provides galvanic isolation, an autoformer cannot.
Will this make a difference is sound for better or worse..I have no idea.
pubul57 OP
3,712 posts
 
Autoformers have been available for some time, John Chapman (BENT) and other premier passive TVC cos chose to use the S&B transformers; I have to believe there was a reason for that. Not saying the autoformers won't make great product, but it seems they were not the first choice when S&Bs were avaiable to the open market.
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