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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: I do not know.Posted by Romy the Cat on: 8/22/2019
 anthony wrote:
Romy, have you had any experience with Autoformer VC's?  From what I can tell they could work quite well at the output of a preamp driving the DSET's, mainly because they lower the output impedance of the preamp as they attenuate rather than staying high like a shunt switched attenuator.  It seems that in this particular situation that an AVC is the only real option apart from a 350R or lower shunt switched attenuator, which I do not find realistic.

Otherwise, I think that the VC will have to go at the input of the preamp and there are plenty of types that are suitable there, but I have a tendency to want to attenuate the large signal at the back end of the pre rather than at the smaller signal at the input.
I do not know. The Autoformer is complicated subject for me and would not be the person to talk about it. Year back a personal friend of my made us a very good Autoformer that he was very proud of. In a few years them he sold it to a larger company and it became probably the best performing and the most celebrated/reputed in high-end Autoformer over the last 30 years. As the craze about it grew in 90s I asked the friend of mine to let me to try it. It worked very badly in my estimation but how can you tell it to a friend who was so proud about it? Mind you that I used multi-amping at that time and there is a chance that something in Autoformer use I did not consider as the parameters of the Autoformer because the part of you line-level filter and it became complicated. Also, at that time I use Lamm preamps that were very different animals and they did some very interesting for me phase processing, which no Autoformer could do…. 

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