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I gave this project a try, despite the fact that I don't know anything about anything. And it was great! Assembling WHAMMY was a great learning experience, for which I can't thank the build thread contributors enough. And the finished project is dynamite! Highly recommended.

Like always a wonderful project to do and learn. It would be impossible to do this for people like me without the generosity of Mr. Pass and the DIY audio community.
Thank you again and again.

It really is a great preamp. Easy to assemble. Very clean sound, no hum and very stable. It dramatically improved the sound in all three of my power amps. For me it is one of the best. Last but not least, I haven't spent days looking for unobtainable components. Many thanks to Waine for sharing this beautiful project.

This case is very nicely designed. Assembly is pretty straightforward, as mentioned the instructions are pretty limited but I was able to work it out without to much problem. I do wish the rear panel had a bit more support, it flexes a bit when plugging in the power cord. It shouldn't be too hard to brace it though. The finish is extremely good, and the packaging protects it well. Overall I'm thrilled with the end result!

This was my first try at building an amp. I have soldered together a few crossovers from speaker kits before, but not an amp. I had some time off so I figured I would give it a shot. I took my time with it and built it over a period of about a week. It went together well without any issues. After hooking it up and listening, I was super impressed by the sound. Sharp, precise, and open. After a little bit , I was curious as to what they would sound like as a monoblock. Ordered another a day later. Completed that build in only a few hours. I now have 2 ACA amps and am verry happy that I built both. Great purchase, project, and amp.

The Galaxy (steel with 3mm faceplate) is a solid unit. I would order it again for certain. A couple of things to note: 1. The stick-on feet do not match the quality of the chassis. I opted for some other feet that raise it higher and will not fall off; 2. Even the 3mm aluminum faceplate/back plate can be difficult to cut/drill precisely if you only have a hand drill and a Dremel. If use are using such tools, get the 3mm version, not the thicker one. My advice: get some thick aluminum sheet to practice on before working on your faceplate or backing plate. Also -- the size of the faceplate and backing plate are slightly different. Label them so you don't make a mistake with drilling!

The baseplate makes assembly and adjustments for positions of components easy. Given the small cost, I cannot imagine going without it.

Boards arrived within 2 weeks to the UK. The board build was straightforward, attached to the rear panel of my F6, delays full current for a few seconds with no turn on noise through the speakers. Great product.

Having built a pair of ACA the ACA mini looked just the job for a compact amp to sit on my desk and drive a pair of Deware Tiny Radials I built from $20 plans. I'm feeding the ACA mini from a Dragonfly Cobalt USB DAC with a QED 3.5mm to RCA cable. The Tiny radials are 80db sensitive 57mm full range drivers that get down to 80hz courtesy of integrated passive radiators. The combination is fast and punchy, holographic, slightly sweet and more than loud enough. It's a very addictive listen as everything sounds so good sucking you in and making it hard for me to complete this review!

As with parts sets I've previously bought for it's big brother the ACA everything required for the ACA mini was there in the kit and nothing missing. I wish there was a package with a tiny metal case instead of the heat sinks but it's good for the money and I value the convenience of a one stop shop.

Arrived within a week to the UK. I’ve used the boards many times, excellent product. I used the diode boards, instead of separate bridge rectifiers this time. It maybe my imagination but the sound output appeared smoother.

No complaints very good quality good instructions sounds good. I upgraded caps, opamps and tubes sounds much better. Only problem was one of the original opamp was bad.

This kit is a fun build. I suppose if you're in a hurry, you can complete it in one day, but I took my time and enjoyed the process. Built it just as provided with all the kit parts. Didn't feel any need to substitute designer parts in, as the standard parts all were of excellent quality. Opted to include an SMPS DC Filter P089ZB Kit and Pete Millett's NuTube anti-vibration mount as part of the build. Note only the blue foam on the anti-vibration mount fit. The B1 is paired with a set of ancient Welbourne Laurel tube mono amps with a Raspberry Pi running Moode Audio Player and a JDS Labs ODAC providing the inputs. I'm loving the sound. There's always a surprise in re-listening to music that I've heard many times before, as this combo is revealing details that I'd missed before. Great clarity and channel separation.

Je suis vraiment satisfait de cet achat. Le kit et les explications sont d’excellentes qualités, continuez comme cela c’est parfait.

Je suis ravi par l’écoute des amplis, la musique n’en est que plus belle…

Je suis déjà entrain de me demander si cela vaut la peine de réaliser un autre de vos projets.

Just finished my Aleph J in a 5U case (big and heavy sitting on my bench) and the sound is just beautiful with my Focal Sopra 2 speakers. Those demanding beryllium tweeters just sound sweet as honey with the Aleph J and the low impedance dip in the base region is a piece of cake for this monster.
Only added the excellent Neurochrome speaker protection to be feel more on the safe side.

Before this I made me the F6 that is also one excellent amplifier to keep.

P.S. the service from the DIY -store is world class!