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You could, but the DAC would be used as a voltage source (not ideal). Why not try a stage that was purpose designed for the application? Say Legato. ;)
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________________
Buffalo24+Tubes (XLR), Retro with MC LO |
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Sure the D1 is a solid choice, but not ideal. Even with massive rail voltage which just adds complexity and wasted current. The Legato is the same type of circuit as the D1 (Common base/gate amplifier), but improved with much lower input impedance. It is low input impedance that is most critical for the ESS DAC. I designed the Legato after a lot of experimentation with circuits like the D1 because I got much better results, both measured and heard, and yes I have tried it exactly as Owen decribed, and no my mind is not changed. :) Legato is a product of lots of R&D and the desire not compromise just for the moniker "D1". It also supports SE output directly. :) Edited by user Thursday, December 30, 2010 6:49:11 AM(UTC)
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Would adding a balanced B1 setup AFTER the Legato be of any use, in say a situation where the power amp has a lowish input impedance (10k or something)?
Btw, Russ, have you experimented with any plastic caps to replace the stock output ones on Legato? Any subjective comments/recommendations would be more than welcome. :)
Happy New Year!
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Hi
Maybe there is some confusion: I was asking whether a Pass B1 buffer could be used instead of the IVY, not the D1.
The B1 is a passive preamp/buffer, an impedance matching device that utilises JFets.
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The output impedance of the legato is already about the same or even a little lower than the B1, so adding one would only add complexity and unnecessary devices in the signal path. I would not suggest using it.
Cheers!
Russ
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dublin78 wrote:Hi
Maybe there is some confusion: I was asking whether a Pass B1 buffer could be used instead of the IVY, not the D1.
The B1 is a passive preamp/buffer, an impedance matching device that utilises JFets. I would not. B1 is not an I/V stage. The DAC would have to work in voltage output mode, and the is far from ideal.
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Russ: Thank you for your explanations. You have persuaded me to go with one of your IV stages. I will most likely use a Volumite controller, and go fully balanced to the Hypex modules, so the next question is Legato, or IVY? Pros and cons, please. Edited by user Saturday, January 1, 2011 7:12:43 PM(UTC)
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Pro for IVYiii with Hypex:
IVYIII is DC-coupled and you may bypass the buffer stage on the hypex modules. No caps or buffers in signal path. Sound great
Pro for Legato with Hypex:
I still have to try it......
Nic
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Despite the above post (Thanks Nic), I am probably going to use the Legato stage, as it appears to be purpose designed for the latest Buffalo. Can the Legato be DC coupled also? I am not sure that I want to remove parts from the Hypex modules. Edited by user Thursday, January 6, 2011 4:27:32 AM(UTC)
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Also IVYIII was purpose designed for the latest Buffalo....
The legato cannot be DC coupled but as the Hypex modules have caps on the input I guess that having them also on the Legato output is at best unnecessary.
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Thanks Nic.
It looks like IVY III is the winner.
I will post about my progress.
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NicMac wrote:Also IVYIII was purpose designed for the latest Buffalo....
The legato cannot be DC coupled but as the Hypex modules have caps on the input I guess that having them also on the Legato output is at best unnecessary. Nope. Better keep them. Once back the the past, I discovered that DC on input at the UcD180 will lead to PSU pumping. I was testing my Hypex with a faulty CD player, introducing a couple of volt at the input of the UcD. Suddenly the overvoltage protection in the amp triggered, measuring (can't remember exactly) +35/-60V on 40V caps. Pretty scary. I didn't test my findings - wasn't ready to blow up the PSU caps. Don't apply DC at input of a UcD - not even if it's AC coupled. Edited by user Thursday, January 6, 2011 10:54:36 AM(UTC)
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