I couldn't be happier. The kit is awesome. The support is great. And the sound? Fantastic.

I was impressed with this pre-amp from the get go. Both as a kit and as a component in my sun room. Intriguing visuals, really good sound and "I built it" as a bonus. One of the best quality kits I have done in the recent past, and easy assembly and support.

Great Job to the team for all their work

Exactly as advertised. This is an excellent side-grade from the Sparkos SS3602. The Sparkos is clear and open where the Burson V6 Classic is warm and rich. ( I haven't heard the v6 Vivid, so I can't compare.) This will give you well-defined, textured bass, without sacrificing too much clarity elsewhere. In my system, the v6 Classic is exactly what I needed. Not necessarily better, just better for my room, gear, tastes. Running this in my Aune x8 -> Outlaw 2160 mk2 -> Dali Opticon 2 mk2. I had a little too much heat right around 9-10k hz, right on top of cymbal strikes. Not fatiguing, just too much information up there. If your tastes run towards anything from ~1979-1989 (think Pink Floyd's The Wall, Peter Gabriel's So, Iron Maiden's Somewhere in Time, New Order's Technique), you have to try these. This op-amp loves that cool, dry, '80s production from your favorite British rock/pop/metal records, as well as Mingus/Coltrane era jazz. If your tastes run more towards 70s rock, recent pop/dance, or you're just a sucker for that last bit of top end detail, then you might try the v6 Vivid, or the Sparkos. As with all op-amps you will need a very resolving system to appreciate the change. This won't change your life, just slightly reorder the priorities of your system's DAC. Still, if you're into this hobby, it's money very well spent. I've found diyAudio is a great seller, and you should definitely spend your money here.

Another jewel from Mr. Pass' collection.
Drives my efficient OB speakers with aplomb.
Also performs some headamp duties on a par with my Zenlite headamp.
Highly recommended.

My eyes are bigger than my stomach and I buy too much. I'll get to it, certainly, but haven't yet. Nonetheless, I'm sure I'll be happy with everything. Thus far all that I've purchased from Diyaudio has been well supported and as described. The electronics world can, it seems, be a tough crowd. I sometimes see stones cast at Diyaudiostore.com and Nelson Pass. The same two are responsible for me daring to try and succeeding. I'm very thankful despite not having any measurements of what I've built to date.

The amp is fantastic but I was worried about getting replacement parts so I squirrelled these ones away.

I was impress by the ease of construction!
The sound became more and more impressive. So i build a second one and run them as bridge mono. More dynamic, less distortion…. Less holographic. I use them with a tube preamp kit, the Sun Valley SV pre 1616 D. And Zu DW6 speakers. I did not tried the ACA in parallel mode. Source is a WIIM Pro with an external DAC the J2 AKM.

What can I say….DIY store & Mr. Pass provide world class products!

I'm going to use this regulator for the preamp stages of tube amp power supplies that I'm going to build. The kit's documentation and explanations are clear for a beginner.
M Didden is very available in case of problem

I'm using the same 19.5 volt laptop adapters that power my Mofos, and it provides the right amount of gain and sounds great.

Seriously, for the price of an adult “happy meal” what’s being offered here is stunningly good! It is a gift.

It’s simple to build. It’s is a refined design from a master of design. For the builders out there I say just “strike while the iron is hot” or miss out on the fun. This is a must-buy kit!

Sound is big on my 95db sensitive speakers.nice sounstage.cool sounding.
No complaints.

Building and finishing the case was much harder the building the electronics. Easy to build for even a novice like mem using the standard bill of materials. Worked first time with no noise at all, even at full volume. Upgraded the op-amp already, with impressive results. Drives my Audeze LCD-X very well. I am really very happy with my decision to build this and the sound quality of the final result. The case it not too bad either!

Transparent, detailed gain without sterility. I would call it top notch to enhance without detraction or subtraction from virtues of the amp stage.

Single ended usage @ 36v, used with Pass DIY Sony single ended SK60 VFET, superb.

In depth.