I've built it with 32V rail and 0.47ohm source resistors this does produce a lot of heat. Make sure you use big heat sinks with this combo. This amp sounds really good with ACP+ or Wayne's 2018 Linestage, clean, detailed and musical. It has no issue driving a pair of Boland Accoustic BTX180 made by Peter Boland of NZ. These are 4 ohm demanding speakers but the amp drives them effortlessly.
quality sound, this preamp is a highly recommended upgrade with my F5 turbo amp and the wilson watt puppy
Simple project, magnanimous sound!
Excellent PSU is a must. The PSU for the Bride of Son of Zen is adequate and sounds great at +-28 Vdc, but I opted for a Sigma 22 design at +-30 Vdc.
Board from diyaudio store is excellent! Fast shipping too. Overall, a great experienced on this project. Very satisfied!!
High quality board and good sunding preamp.
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.
The BA-1 Monoblocks are finished. Beautiful sound - a bit special - perhaps the single ended class A concept.
I like this amp!
Quality product like all DIYAUDIO products. There is a zener diode mis-labeled as 2N4739, it should be 1N4739. It is a 1 watt 9.1 volt devise.
It was a challenge to find the correct schematic as the board part numbers were not the same as the linked one. This is the correct place to see it. https://www.diyaudio.com/forums/diyaudio-com-articles/154777-burning-amplifier-ba-1-a.html
Also, see attached schematic.
Fantastic pcb! Top quality! Very fast delivery around the world (USA-Germany) in under
one week.
I found a pair of TOSHIBA 2SJ109 and I thought I should build a BA-1 poweramp with the
singleended follower. Not finished yet. Intake board is done.
Greets
Dirk
I found a pair of original TOSHIBA 2SJ109 BL - I was searching for a long time.
Now it was time to start this build.
The BA-1 - pcb is of excellent quality. Delivery was extremely fast as well customs.
The fun starts now....
Can´t tell anything about the sound - not finished ;-)
Greets
Dirk
Crystal clear sound with drive and slam. Excellent purchase!
A very good quality board.
Finally got around to giving the BA1 a try as linestage. Couldn't be more pleased. Very similar to the ACP+, but with dual rails. Offset was so stable that I removed the output cap with great results. A beautiful, single-ended gain stage!
what say.....Perfect!!
as always.
diyaudiostore is totally among the best!
Good quality but the solder pad for power transistors could have made bigger.
The BA-3 boards are excellent quality. diyaudiostore does a great job with all their boards. As for the BA-3 itself, do not hesitate to build this amp. Do it now, you will not regret it. There is something really really special about this one.
For college Electronics final project
Combined with my Duel mono ACAs In my hand built backloaded pause text BK 20 speakers I definitely will pass electronics analog class. Instructor is an audiophile amplifier nerd 👍. Next semester‘s class tackle the Alpha J Mono Blocks.
Yes this PCB set I have been waiting for a while, obviously many who will build this, my plan now when I finally got one copy is to build it during the winter, some important components are now collected so it comes . Must be allowed to thank the DIY Audio Store for giving us DIYers this opportunity to trade finished PCBs for N.Pass constructions.
Great service
One thing that I didn't realize is on my Macbook the BOM link auto downloads an Excel file without a notification. I missed the download at first.
Really like the high quality DIYAUDIO boards.
Excellent board. High quality as usual. Would make an excellent preamp as well.
High quality boards and very good sounding pre.
The boards are of excellent quality. Delivery in under 3 days from USA to Germany - supersonic!
Still collecting parts.
Greets
Dirk
Hello,
The service has been great; communication as well and the product is almost flawless if not for a slight trace error on the drain of Q5 that is easily fixed adding solder (if not detected the circuit still works unaffected until a certain load).
So overall thank you for a good service.
DIY Audio boards are well made and I know I can trust the design. Their packageing and shipping are also top notch. Overall a pleasure to do business with.
Excellent quality PCB any novice could complete.
If there is a wish list, bigger pads please - less likely to pull away if the circuit is modified later.
The only build issue I have is the heatsinks fins are covering the mounting holes I wanted to use (Note to self, next time, fit PCB spacers first!).