I'm not a fan of Op-amps, but if you're faced with no other option, the Burson V5i is perfect. The D50s is very compact but fitment was no problem.

You must run a signal through the DAC for a least 100 hours before serious listening... the result is a much better presentation of a sound stage, less high frequency hash and more realistic voice. Every passive and active device will benefit from a breaking in procedure.

saw some people mentioning this was their pick with the Xduoo XD05 line threw one in my basic and wow, made it warmer and fuller sounding.
drawback is that it makes it take longer to turn on and it makes a odd pop noise in sensitive IEM's.
tempted to get another too try in the cheap Douk amp with hot swappable op amps and if I can budget it my next amp will def be a Burson amp

I dropped a pair of thses into my DIY Muffsy phpne pre-amp and WOW! Large improvment over the stock op-amps. I finally have the noise down low enough on my vinyl setup to listem on headphoones. Good product!

Just had the V5i installed inside the DAC and the improvement manly in stage and sensing more details is obvious

This Burson Audio V5i op-amp is sweet! But before I get to that, I want to comment on the service from DIY Audio. In a word - excellent. I initially ordered this item several months ago, and it arrived quite quickly, and well-packaged. After using it in my external DAC for a few weeks, though, there was a problem. Lots of static and pops in the left channel. Uh-oh, defective unit. I contacted DIY by email, and they shipped me a replacement, no charge and no questions asked. Awesome.
So now, I've been using the new one in my system for a few weeks, and I love it. Improvements in sound quality are not drastic, but are nonetheless quite noticeable. The bass is more extended, and very tight. Vocals seem more natural and nuanced. Best of all, the sound-stage is opened up, and individual insruments can be more precisely placed.
Thanks to Burson Audio and to DIY Audio!

The V5i's make together with my Nobsound NS 08E a big step toward performance

I have an Ah! 4000 cd player. This player is a Marantz cd4000 that was factory modified. It as designed to be tweeked. It has a tube output stage. YOu can roll tubes and opamps. There was also the option to add an upsampling chip. I purchased and added the upsampling chip. The improvement in sound was remarkable. However the chip has fried and the manufacturer no longer supports the chip. I chose to upgrade the opamps with the hope of recapturing the sound quality that was lost when I had to remove the upsampling chip.... I would recommend this opamp to anyone who has the OPA604 single opamp and is looking to improve the sound..... It vastly improved the sound of mine without having to use an external dac.

Hello all...

To begin with, I've been an audiophile for a good 54 years now. When it comes to DIY scenarios such as changing out OpAmps, I am a novice and just recently became intrigued with doing things like this. This all began when I purchased the very inexpensive Douk Audio U3 Mini Class A Headphone Amplifier, which by itself costs less than $40. But what intrigued me was the reviews this little Headphone Amplifier has been receiving and the fact that you could change out Opamps at will. So I invested in one and was very impressed, with the Douk Audio punching far above its weight - giving many a competing headphone amplifier costing up to $150 a run for its money.

Now enter the use of the Burson Audio V5i Hybrid Opamp. As soon as I received the Doug U3 Mini Head Amp, even though it sounded superb in my particular set up (initially attached to the Schiit Modi 3 DAC), I began experimenting with different Opamps. In the process I purchased 7 different Opamps and let's face it, "most" Opamps run a dime a dozen. But I wasn't satisfied with all of those other Opamps (some making the sound too bright and harsh, while others made the sound a bit bland and overly homogenized). Then I read an article about this particular Burson Opamp. "Whoaaaa," I first thought - 'cause this Burson costs as much as I paid for the Douk Headphone Amplifier itself. I was almost ready to ignore purchasing this Burson Opamp, but the more I read, the more I realized that I should give it a try. And wow, am I glad that I did (the ole' adage, "you get what you pay for" really applies here).

Now where to even begin regarding perceptions of sound qualities. Alright, so I switched out the Opamp inside the Douk Audio Head Amp, exchanging their stock TI-NE5532 classical op amp (which sounded very nice in its own rite), with the Burson V5i unit. What occurred then had me doing a double loop. The resultant sound just opened up - by a large margin. You are literally (with good recordings of course) drawn into the performance. I became totally enveloped by the atmosphere and ambience of various performances. The sound staging opened up even more with an added amount of "air" around each instrument. More so, instruments come across as very smooth, and strings such as can be found in a large orchestra, had a silky sheen to them. Imaging is also improved. The best way to describe this Burson V5i unit Opamp is that it substantially enhances the spatial presentation of a musical performance.

Without exaggeration, inserting this Burson Opamp into my budget (yet highly competent) Douk Audio U3 Mini Head Amp, I began to hear audio qualities normally reserved for far more expensive units. I am stunned to be more exact.

I then (using this Douk Audio U3 with Burson Op Amp) began pairing up with other DAC units - and the results were the same - just a substantial improvement on the sound.

So I highly recommend this Burson Audio V5i Hybrid Opamp to anyone who has experimented with changing out Opamps. I am so glad that I did not pass this purchase by. It was well worth the money, and I can say - without exaggeration - that the audio performance I am now experiencing with the budget Douk Audio U3 Mini Head Amp, coupled with the insertion of the Burson Opamp has elevated everything.

Color me most satisfied and thus my 5-star rating.

Ben Herrmann
Fuquay-Varina, NC