ARC has several. So does BAT. On the more affordable end, Audio Experience makes a fully balanced pre for about $1K. I am more than sure that there are others. Happy Listening.
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A 'fully balanced' preamp will not have the signal appear anywhere in the circuit in single-ended mode, except at an input. So all the switching, the volume control, EQ is all in the balanced domain.
What are the advantage(s) to this approach?
Is there a differential input in this approach?
Obviously, it costs more due to double the parts count. Isn't there a potential issue with parts matching between the two phases of the circuit?
Sorry, it is not truely balanced, only psuedo-balanced, like VAC. Balanced inputs and outputs, but not a balanced internal circuit. They use a transformer to change to/from balanced to their single ended internal design. I've been trying to get Joseph to build a fully balanced design.
Now that he's come out with a remote control, he's one step closer to me trying one of his designs. However, with a fully balanced front end and amplifier, I'm obviously holding out for a fully balanced preamp, not a pseudo-balanced design. Not that his preamp doesn't sound good, but as the thread title implies 'Truely Balanced Pre Amps', the Audio Horizons TP 2.0 definitely does not belong in this group.