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HI The DAC chip in my jvc xlv211 has two out of phase analog outputs for each channel. One article I read states that these are combined in the filtering and output amp stage to cancel out any errors that are still present after all the digital error substitution and concealment do or don't do their job. A simple tube circuit I rigged up is single ended only so I am only using one side of the balanced analog DAC output. It sounds quite good but I guess I am not getting the final error correction function? Can anyone shed bright engineering light on this? Is there a way to rig up a second tube to amplify the out of phase signal and then combine or subtract them to re-create the error fix done by the onboard transistor circuit in the JVC? Thank you.
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How about a high quality IT transformer?
The two out of phase signals could be combined in the primary and the secondary could be wired single ended to drive your single ended tube stage.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Wow that is a great idea. The signal level is pretty low, maybe 50mv I am guessing. The xfmr would have to be carefully selected for low noise and optimum transfer characteristics and be unity gain. How hard can that be? Or can I just enjoy it listening to one side without the correction? Quality is excellent but could it be even better is the question?
Talk to the guys at Jensen Transformer, tell them exactly what you're doing and see if they has transformers for you.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Kevin Carter @ K&K Audio sold a kit with Lundahl transformers for a "passive" I/V stage for a balanced current output DAC chip like the PCM1794. You could post a question over on the K&K forum.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Have Fun and Enjoy the Music
"Still Working the Problem"
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