How can I implement the D1-Stage with an Ultra-Analog-DAC (parasound 2000)?

Blitz · 30th December 2003, 08:52 PM

I thought it should be promising to combine one of the best DAC (Ultraanlog DACD20400A) with Nelson's Outputstage. Well, only two issues:

1. Does anyone know how much current this DAC produces ? Neslon's D1 is made for 2mA of the PCM63.

2. How should it be connected ? Obviously OUTR is the signal, but why is AL0 /AL1 both grounded ? I would assume that I connect the D1 directly to OUTR, right (see attachment)?

Best Regards
Frank

uli · 31st December 2003, 08:34 PM

Hi Frank,
the Ultra Analog DAC has a buffered lo impedance voltage source output

Guten Rutsch!!!

Uli

Nelson Pass · 31st December 2003, 08:51 PM

In that case, the D1 stage is not appropriate, as it
expects to see a current source.

Blitz · 2nd January 2004, 11:41 AM

OK, in that case I will forget the Ultra-analog-DAC and combine the D1-Stage with my TDA1547 (with 1mA output). I know that this has been discussed before iwth changing the current through the 610 from 10mA down to 1mA, but I have not understood if ths has finally worked out or if Nelson sees this as a good approach to change the D1-stage (with only 1mA of current through it, obviously bandwith etc of the stage will change).

By the way: HAs anyone tried to convert the D1-Stage into a tubestage ?

Nelson Pass · 2nd January 2004, 06:24 PM

You will get less distortion with the higher current figure.

As to using a tube, there is nothing to stop you.

promitheus · 4th January 2004, 10:08 AM

well you could try to make the D1 output stage with tubes.
It´s I think a good idea but I am not so good with tubes.
There are even tubes you could use at low voltages.

Klaus · 5th January 2004, 08:06 AM

Quote:

Originally posted by Blitz
OK, in that case I will forget the Ultra-analog-DAC and combine the D1-Stage with my TDA1547 (with 1mA output). I know that this has been discussed before iwth changing the current through the 610 from 10mA down to 1mA, but I have not understood if ths has finally worked out or if Nelson sees this as a good approach to change the D1-stage (with only 1mA of current through it, obviously bandwith etc of the stage will change).

By the way: HAs anyone tried to convert the D1-Stage into a tubestage ?

Hi Blitz,

you asked my before in the other tread about this issue. I did not answer because my project was postponed...

But right now I start to test the modified D1 stage with the TDA1547 just sourcing 0,1mA. Details will follow here.

I finally biased the circuit not at 1mA but at 8mA using a double JFET 2SK389. CCS like in the Aleph P1.7 everywhere. My listening tests just start...

Regards

Klaus

promitheus · 5th January 2004, 10:26 AM

That sounds very interesting.
Please post more.

Klaus · 5th January 2004, 11:12 AM

Quote:

Originally posted by promitheus
That sounds very interesting.
Please post more.

More to follow but for the curious guys already some pics... (sorry in another forum in German language) http://www.audiomap.de/forum/index.p...id=15097&page=

regards

Klaus

promitheus · 5th January 2004, 11:22 AM

that´s funny I was just looking at that before I read it here.

what did you use as output caps where Pass uses 220uF?

31st December 2003, 08:34 PM	#2
uli diyAudio Member Join Date: Dec 2002 Location: Vienna, Austria	no current source Hi Frank, the Ultra Analog DAC has a buffered lo impedance voltage source output Guten Rutsch!!! Uli __________________ 'Jazz is not dead, it just smells funny' F.Zappa

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31st December 2003, 08:51 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	In that case, the D1 stage is not appropriate, as it expects to see a current source.

2nd January 2004, 11:41 AM	#4
Blitz diyAudio Member Join Date: Nov 2002 Location: Cologne, Germany	OK, in that case I will forget the Ultra-analog-DAC and combine the D1-Stage with my TDA1547 (with 1mA output). I know that this has been discussed before iwth changing the current through the 610 from 10mA down to 1mA, but I have not understood if ths has finally worked out or if Nelson sees this as a good approach to change the D1-stage (with only 1mA of current through it, obviously bandwith etc of the stage will change). By the way: HAs anyone tried to convert the D1-Stage into a tubestage ?

2nd January 2004, 06:24 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	You will get less distortion with the higher current figure. As to using a tube, there is nothing to stop you.

4th January 2004, 10:08 AM	#6
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	well you could try to make the D1 output stage with tubes. It´s I think a good idea but I am not so good with tubes. There are even tubes you could use at low voltages.

5th January 2004, 10:26 AM	#8
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	That sounds very interesting. Please post more.

5th January 2004, 11:22 AM	#10
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	that´s funny I was just looking at that before I read it here. what did you use as output caps where Pass uses 220uF?

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