any simple circuits I can add to a dac?

Tristanc1 · 17th March 2009, 01:04 AM

Hi,

Looking to learn a bit more about tubes, I have 2 dac kits sitting here waiting to be assembled on is from audiodiylab the dac301, which I can't seem to find a link for anymore, and the Opus dac from the twisted pear guys, found here. Is there anything that I could add to either one of these dacs using tubes? Not looking for a performance upgrade or anything just looking to learn a bit more about the subject, so hopefully there's something relatively simple that I can get my feet wet with? I already have a commercial tubed integrated otherwise i'd go that route, and build a pre-amp or something..

If anything comes to mind let me know

Tristan

d to the g · 17th March 2009, 02:01 AM

Lampizator!

revintage · 17th March 2009, 06:36 AM

I´d say that Lamp.....s tubecircuits aren´t the most impressive.

With the Opus there is no need for tube circuits. Just go for a good Lundahl transformer to go from balanced to unbalanced.

If you want to go tubes anyway, there are at least two threads in "Tubes" about about a "differential CF" solution for balanced to unbalanced. Kenpeter initially came up with the idea. You will need one 6DJ8/channel. This is the one:

http://www.diyaudio.com/forums/showt...81#post1666681

Tristanc1 · 17th March 2009, 05:51 PM

Fantastic, thanks guys. I'll check into both of them and then come back if I have questions...Or should I say when I have questions!

Thanks!
Tristan

dheming · 17th March 2009, 08:00 PM

There's also a simple single tube gain stage kit available from Deware: http://www.decware.com/newsite/zkit4.htm along with a simple power supply to go with it: http://www.decware.com/newsite/zkit5.htm

kenpeter · 17th March 2009, 08:14 PM

Wether you choose Transformer, Differential CF,
or Wakko (Differential White Cathode Follower)
The important detail is that they are differential.

All the above reject common mode noises the
cables might pick up along the way. To include
any power supply noise belonging to the DAC.

For that reason, you might want this built close
or into your amp, rather than closer to the DAC.

17th March 2009, 01:04 AM	#1
Tristanc1 diyAudio Member Join Date: Jan 2006 Location: edmonton	any simple circuits I can add to a dac? Hi, Looking to learn a bit more about tubes, I have 2 dac kits sitting here waiting to be assembled on is from audiodiylab the dac301, which I can't seem to find a link for anymore, and the Opus dac from the twisted pear guys, found here. Is there anything that I could add to either one of these dacs using tubes? Not looking for a performance upgrade or anything just looking to learn a bit more about the subject, so hopefully there's something relatively simple that I can get my feet wet with? I already have a commercial tubed integrated otherwise i'd go that route, and build a pre-amp or something.. If anything comes to mind let me know Tristan __________________ When I was young I really wanted a bicycle, I used to pray every night for god to bring me one. But as I got older I realized god didn't work that way so I stole one and begged for forgiveness.

17th March 2009, 06:36 AM	#3
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	I´d say that Lamp.....s tubecircuits aren´t the most impressive. With the Opus there is no need for tube circuits. Just go for a good Lundahl transformer to go from balanced to unbalanced. If you want to go tubes anyway, there are at least two threads in "Tubes" about about a "differential CF" solution for balanced to unbalanced. Kenpeter initially came up with the idea. You will need one 6DJ8/channel. This is the one: http://www.diyaudio.com/forums/showt...81#post1666681 __________________ Brgds Lars

17th March 2009, 05:51 PM	#4
Tristanc1 diyAudio Member Join Date: Jan 2006 Location: edmonton	Fantastic, thanks guys. I'll check into both of them and then come back if I have questions...Or should I say when I have questions! Thanks! Tristan __________________ When I was young I really wanted a bicycle, I used to pray every night for god to bring me one. But as I got older I realized god didn't work that way so I stole one and begged for forgiveness.

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17th March 2009, 02:01 AM	#2
d to the g diyAudio Member Join Date: Aug 2006 Location: minimalopolis	Lampizator!

17th March 2009, 08:00 PM	#5
dheming diyAudio Member Join Date: Jul 2006 Location: Bay Area, CA	There's also a simple single tube gain stage kit available from Deware: http://www.decware.com/newsite/zkit4.htm along with a simple power supply to go with it: http://www.decware.com/newsite/zkit5.htm

17th March 2009, 08:14 PM	#6
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	Wether you choose Transformer, Differential CF, or Wakko (Differential White Cathode Follower) The important detail is that they are differential. All the above reject common mode noises the cables might pick up along the way. To include any power supply noise belonging to the DAC. For that reason, you might want this built close or into your amp, rather than closer to the DAC.

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