Hello I have bought them to build the "Boozhound Laboratories Deluxe JFET Phono Preamp". I have just soldered them, check the DC biasing and it was everything perfect according to spec. NO troubles. Sound is great and clean. Noise is very low.
It was a good service.
The chassis was very well built, particularly for the price and worked well for my purpose. I ordered the 10mm front panel and it gives the amp a very finished look.
What a wonderful sounding preamp. Build took me about 4 hours as someone with moderate experience with electronics and a soldering iron. This is now sitting in front of Aleph-J and I'm in love with the sound. Microphonics were a problem but not hard to tame following others recommendations. Now just to finish my new DIY speakers......
I couldn't get over how EVERYTHING was in this kit. All quality parts. These guys know what they are doing trust me, cause I surely don't. I've never built anything electronic in my life. I'm the definition of beginner and I finished this amp in 3 days! It sounds amazing. Worth more than the price. I highly recommend this kit.
I ordered the LSJ74/LSK170 matched octet and I am happy with how my B24 amp sounds. Despite the long delays on the stock, there was some hiccups with the delivery to South Africa but once that was sorted out it didn’t take more than 3 days until the order was in my hands. I am happy.
Kit arrived very well packaged . With help from the build thread it was a straight forward build. I placed a piece of carpet underlay felt under the Nutube and the silicone ear pieces from earbuds on each mounting post. It is hooked to a M2x and sounds very nice.
BA3 is one of the best sounding preamplifier that I ever built.
I got ten pairs of J77 & K214 MosFets, so I keep 3 BA3 PCBs for spare.
I purchased the boards and case combo. The store experience was top notch as always and the distribution center is fairly close so it arrived very quickly. The one click Mouser BOM was awesome. The build guide, again awesome! Not my style of building but still easy to follow with good detail. Nice fun build that made for some enjoyable evenings too. Highly recommend just for the fun of building it!
It sounds great to me. Very very quiet, smooth Mid’s and nice highs for what my old ears can hear. I’ll be happy with this for a while. I use a Bottle Head Crack /w Speedball in my main system currently I’ll see how it compares after some good listens.
I built a pair of MOFO’s. The first was a modification of an amp camp amp and the second was a second life for a M2 clone where I used these boards. I really like the sound of the MOFO driven by a variety of tube preamps. Easily more transparent than my F4 clone and M2 clone sans buffer and input transformer.
My issue is the same as previous review, namely the layout of these boards. The mounting holes are way too big for common m3 hardware and the through holes are way too small for 14 or 16 gauge wiring or even for a typical snap fit capacitor for the output. Much easier to just cut some traces on the ACA board and use it instead. Should be an easy relayout for someone to make more similar to the Pass clone boards.
Perfect matched transistor with a long lead time (6 weeks)
Already in use in my F5 with very good results
Measurement will come very soon online
After the great customer support from Elena and Jason, the kit arrived in The Netherlands. Perfectly packed, clear instructions and all parts complete. The instruction manual is of a very high quality ( respect! ) and building the amp was not very complex and a lot of fun to do. You need a bit of solder skills and the right material though. Unpacking the big Lundahl trafo's was a special moment, they are beauties. After finising the kit and putting in a complete Genalex tube set, i first listened with a cheap headphone to be sure everything worked fine. Sound was a bit muffled ( brand new tubes ) in the beginning but it was already very promising. I could not resist and connected it to my Klipsch Forte III and Lumin A1 to listen how it sounds and see if i had enough power. Well....more than enough! After connecting the TU-8600 i let it play for days to break in all parts, no critical listening, just background music. Last night i was listening with my girlfriend and we sat on the couch for hours, number after number, album after album and we could not stop. I'm 42 and had all kinds of equipment at home. Only transistor amps and my last on was a 2x30 Watt class A of 14K. None of these made me cry of musical emotion...this one did which was a revalation. Stage, immense detail, dense natural spooky real sound, articulation of voices, bass speed, power & detail...all there at any volume. Also when you play at low volume all is there which is very important for me, i don't want to play loud all the time to hear all details. The only thing i changed were the ECC82's which are Philips Miniwatt's now to give the sound a bit more 'body' but that's more personal taste. I'm very very happy with this amp, and it feels like an endpoint now. What you read in the reviews is true, it is that good. A big thanks to the designer of the amp and diyaudiostore. You made me a happy man.
This was the first time I built an electronics kit since I was maybe 10 or so. Went together very smoothly. The available documentation for this kit is great. I nearly bought a cheap "tube amp" of dubious origins on Amazon, but decided to build the starving student after reading lots of great things about it. I am glad I did. This amp adds real presence to both my headphones and to my newer Sony HiFi amp when used as a preamp.
this is a really good unit considering the price, i am replacing my Massdrop CTH with this. this is a really dynamic amp and a really neat kit
She’s so magazine with First-Watt F4 more than Ba-3 Preamp.
Although her voltage gain is small, she doesn't sound like it.
I bought the PCB from DIYaudiostore and manually selected the parts from Digikey/Mouser etc.
PCB is of high quality and once assembled, the amp worked right away.
Sound quality is great, clearly above my JDS Atom, but I advise to play with input coupling caps and Op Amp to get the best synergy with your other gears.
I went for a slightly bigger chassis (Hifi 2000 Galaxy GX283 80x230x230), and it gives plenty of space to play around.
Be aware of the extra cost due to customs (shipped from US to EU, +33E in my case).
Turns out I needed printing to get looks to match the ACA that I wanted but the factory where very helpful and after a couple of e-mails they posted out exactly what I'd asked for with no delay at all.
This long shallow case was just the right size to fit in front of my turntable and house Pearl 2 PCB's. A couple of components will be a squeeze but worth the effort for a professional look. Custom face plate with "Pass Pearl 11 Phono Pre - Amp" printed on it to match ACA just adds to the pro look. Just need to order the rest of the parts now.
A really nice pcb. Follow the directions on diyaudio, and you'll have a great-sounding amp. Drives both my Grados and Sennheisers with ease. Looking forward to some op amp rolling. Thanks for making this available to diyers!
What a great preamp!
Easy to built and what a sound! I am really amazed about its soundscape: deep, large and full of details...
I recommande it absolutely ! Sincerely yours, Thierry Malarmey-Dorel
The MOFO is a fine amplifier: organic and rich soundscape, very natural medium range.
Of course, it depends totally on the quality of your preamplifier. Very easy to build, it is sincerely a great satisfaction.
I recommande it absolutely. Musically yours, Thierry Malarmey-Dorel
Bought to build ACA matching power supplies and bolted on top of the ACA. I cut a big hole in the ACA top and cut and trimmed the ACA to brackets to get the transformer in and sticking out the top. Very pleased that a quick dusting with satin black paint over the top of the lid covered bare Aluminium edges but the brushed finish still came through leaving a factory OEM look. I love how professional these case look.
This is a great kit, and a fun build with decent instructions. What struck me is the cleanliness of the sound even at high volume with a complete inaudibility of hiss. At the normal unity gain setting, you'll notice you'll have to really crank the volume to reach your desired spl, but it's ok, because you have the 3x gain option as well and it maintains its tight, fully-fleshed, focused control on sound reproduction even when pushed past a 2 'o clock setting on the volume dial on normal unity gain setting.
I found it to be extremely transparent if your source, power amp, speakers and placement, cables and interconnects are up to the challenge.
It is neutral, transparent, and very easy to listen to over extended periods and not classically "tubelike", warm or even sterile or clinical for that matter. Try listening to something like a SACD player through it and you will be impressed with its detail retrieval, fleshed out bottom end and airy highs.
Like any kit, there are opportunities to substitute your own parts if you like to experiment with the resulting outcome of sound which I did in an attempt to make it even a little warmer, "tubelike" or vintage HiFi sounding. However, all parts supplied are well-considered and of very high quality. In fact I found it somewhat difficult to source parts of higher quality than what is originally supplied. There is no reason to have to sub anything, really. I can tell you it is rock steady and maintains a very clean, accurate, transparent sound whether you stick with all stock parts or substitute some of your own, much like how Elekit gives you an AMTRANS resistor option. Any way you slice it, it's a great sounding preamp with a clean, robust circuit design and a pretty good phono stage as well with the ability to swap its opamps to change the phono's flavor. I only wish it had one more set of RCA inputs however, so I could simulataneously hook up all my stereo gear at once including an HD radio. Great preamp, I reco...
The BA-1 Monoblocks are finished. Beautiful sound - a bit special - perhaps the single ended class A concept.
I like this amp!
Fast delivery, top quality parts. Sound amazing, very easy to build and adjustments. Thank you 6l6.