Possible New DAC for Discrete Opamp Rolling

Hey douglas.  None of these op amps will cause damage if they are put into an un-modified device.  Don't even worry about that.  They are all designed to work exactly as a standard monolithic op amp.  However, these high current discrete op amps can sound somewhat bright/thin and have a solid state harshness if they are starved for power.  Looking at internal pictures of the Minimax, I can see that there are some capacitors close to the op amps, but I cannot tell if these are power supply caps or if they are DC signal blocking caps.  In any event, if you want to try out different op amps, go for it.  As I said, the Sonic Imagery are the best in my opinion, but they are absolutely huge and will not physically fit in some locations.  The Burson V6 Vivid is second place and gives a little less resolution and more warmth, but it still has more overall resolution than the Sparkos.  The Sonic Imagery are the most demanding, but even the Burson V6 Vivid and the Sparkos can sound a little thin/bright without good power.  Making sure you have a good amount of power capacitance very close to the op amp will make the op amp sound smoother and fuller.

I have tried the previous generation NawClassD op amps and regulators and was completely unimpressed with their stuff.  The op amps were the Special Edition with super fast slew rates.  In some ways they sounded better than monolithic, but after some time listening, I could tell that there were problems with the sound and resolution/air.  The regulators were complete crap and made any equipment sound like low resolution consumer electronics.  I have not tried the new models they have release.  The design is different and uses different discrete components, but I don't know what the result is.

The Sparkos regulators are absolutely amazing!  I recommend them for replacing any existing 78xx/79xx voltage regulators (if you are adept at desoldering/soldering projects).

In my opinion, the best monolothic op amps are opa627, opa827 and ad797, but all three of these have compromises in one fashion or another and are not as good as the discrete op amps.

You may have missed my suggestion, but if you want, keep your eye out for a used L.K.S. MH-DA003 DAC, which is the previous model (maybe on ebay or audiogon). These are excellent DACs and have sockets for swappable op amps. Not many DACs have the sockets and most are soldered directly in. I have a Emotiva XDA-2 DAC and i have to remove the op amps and put in sockets so that I could "roll". You could probably get the LKS for about $1k or maybe less.

auxinput, have you tried mixing and matching the the brands? I did a lot of that with the first flight of Burson, NewClassD, and Sparkos years ago, and I was able to attain much more range of results. It's a time consuming thing to try all variables with many Opamps, but imo well worth it. With the variety of combinations I was able to tune the DAC to any rig I established. I'm looking for even more capability with the new Bursons, and I will probably try the Sonic Imagery. 

Yes, I saw the DAC recommend. Your advice has been hugely helpful! 

Yeah, I have tried a massive amount of combinations.  It's always a give-and-take or elements of additive/removal depending on what combinations you use.  At this point, I run a combination of Sonic Imagery 994Enh and Burson V6 Vivid in my Emotiva DAC and Rane stereo line mixer / preamp.  I only run the Burson because I have several spots where the Sonic Imagery just won't fit and the V6 Vivid is the next best op amp (for resolution and transparency).

There are hardly any DACs out there that I know of which still use socketed op amps.  Most will have the op amps soldered directly onto the board and many actually use the very tiny SMD op amps.  The LKS is one that I know of that still used sockets.  You could also look at an Asus Essence DAC (such as the Essence III), but I suspect the LKS is highly superior (but could be hard to find).  There could be other DACs with sockets.

On another note, if you want to roll opamps, the Kinki Studio EX-M1 integrated amplifier has socketed op amps for the preamp/driver stages.  These are ripe for some Burson V6 op amps and would make a really "awsome for the money" integrated with discrete input stage when upgraded with the Burson.

Auxinput2, thanks for your posts.  I have an XDA-2 and would like to upgrade it.  Can you tell me how many of each opamp you used, and where they went?  Perhaps a pic if you can spare the time?  I assume the Bursons are not too tall to fit inside? And, if you don't mind one more newbie question, what sockets did you use?

If I want to start with just two opamps, where might they go?

Did you upgrade coupling capacitors as well?

Thanks!!