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Tristanc1 17th March 2009 01:04 AM

any simple circuits I can add to a dac?

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:)

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


revintage 17th March 2009 06:36 AM

IŽd say that Lamp.....s tubecircuits arenŽt 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:

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!


dheming 17th March 2009 08:00 PM

There's also a simple single tube gain stage kit available from Deware: along with a simple power supply to go with it:

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.

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