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Old 27th April 2013, 11:06 AM   #31
McGyver is offline McGyver  Poland
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Quote:
Originally Posted by luxury54 View Post
thank you very much for your quick answer
Don't know if I remember well but seems like the tube stage used to invert the phase of the signal so are you using only the L- & R- (since this will be reverted)?
Yes, this tube stage inverts phase, so I take the signal from (-) outputs. But I don't believe in absolute phase, so it's not essential.
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so this would mean that you are using L+ & R+ to GND via the I/V resistor?
yes
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of what value is this I/V resistor you are using?
It depends on gain of the following stage. In this case ~120ohms will do.
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I have already a tube output for CS4397 but with 1 x russian 6N6P tube and I also have a similar tube output for TDA1541A using 2 x 6N2P russian tube (a la lampizator design)...do you think that changing these values of components that you gave here might worth a try using that kind of tube only as a quick and dirty solution for the PCM1798 ?
CS4397 is voltage output DAC, if you use lampizator style gainstage you get about 20V signal level at output. It's too much for solid state amplifiers and it may lead to damage.
You can try this stage to PCM1798, maybe you will have to change IV resistors value due to different gain of the stage.
The 6N2P tube has very huge internal resistance so you will have big output resistance of the stage. It may lead to weak sound with most of solid state amps and some of tube amps.
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(it would be just for a quick comparison and later I would build a separate circuit if it would be worth it soundwise)
Many thanks!
Improper gainstage may lead to poor sound and you may never know how great PCM1798 can sound.
I do not appreciate soviet tubes (maybe excluding 6S4S and GM70 with copper anode) and always make efforts to substitute them by western ones.
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Old 28th April 2013, 09:58 PM   #32
Starre is offline Starre  Sweden
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My budget is what is needed for a top dac, I think this Hegel D25 might be a good bet. Price is 2000 euro.
Hegel Music Systems - HD25
I do want to buy a ready to play unit, not DIY.
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Old 28th April 2013, 10:25 PM   #33
McGyver is offline McGyver  Poland
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I think there is rather small chance to buy a really top class DAC at this price. Very good one - maybe, but not really top class.
And (thanks to knowledge from this and similar places on the web) one can quite easily build from scratch a really top class DAC at a fraction of that amount. Including really pretty enclosure.
That's my opinion.
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Old 29th April 2013, 06:14 AM   #34
Starre is offline Starre  Sweden
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Ok McGyver, I will consider that.
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Old 30th April 2013, 07:33 AM   #35
Starre is offline Starre  Sweden
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I am now thinking of getting a T+A DAC 8, I will borrow one today if I can.
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Old 30th April 2013, 07:39 AM   #36
McGyver is offline McGyver  Poland
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So tell us how it sounds in comparison to something known.
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Old 30th April 2013, 07:47 AM   #37
Starre is offline Starre  Sweden
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Yes I will when I am done with testing.
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Old 30th April 2013, 04:02 PM   #38
Starre is offline Starre  Sweden
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It was sold out, waiting for next shipping.
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Old 1st May 2013, 05:34 PM   #39
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Hi McGyver,
I just found a pdf file from lampizator site with an alternative schematic of a tube output for PCM1798 it uses some small miniature tube 6N16P and the component values are like in the picture, did you happen to try out this kind of tube output in the past ?

Click the image to open in full size.


regarding your advice, I found an earlier schematic posted also by you, so one more question, your actual implementation uses that I/V resistor from both phases like in this drawing or just from a single phase and the other is floating? thanks

Click the image to open in full size.
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Old 1st May 2013, 05:48 PM   #40
McGyver is offline McGyver  Poland
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Yes, I tried SRPP configuration, but with other tubes, not 6N16B. And the circuit with common cathode followed by cathode follower sounds better in my system.

My earlier schematic needs a lot of effort with finding right values in cathode and IMHO gives no advantage in sound quality in comparison to circuit feeded from single phase only. So I considered why to bother?
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