Well, you'd be surprised how much you might do with this no gain amplifier. You should read up on it and if it seems you'd like to give it a try you will be rewarded with a new and lovely perspective.
It will show you what you need to know about your preamp. It will show you how a speaker can be really controlled. I use mine to drive a pair of high efficiency sub woofers because of the control afforded. It is a great tool in making music and taking a full assessment of where your stereo is at. I have built the F4, F5t, F6 and the Aleph J, all very good experiences and all still in service but the one that taught me the most about stereos is the F4.
All of the kits here are a great bargain and very well made. The gift from Nelson Pass and his supporters is not to be passed up. Build this amp! You'll be educated and it'll be fun!
Great service and fast delivery, as always from the store.
Excellent quality boards. Fast delivery
F4 is a great sounding amp and a fairly straightforward build. Only issue I had was a slight mismatch in the Mosfets that showed up measuring bias across the 0.47 ohm resistors. No idea how common that is but fixing it required swapping two mosfets. If you have the ability to match test the mosfets before installing I suggest you do that otherwise you may have to desolder and reinstall them to get a better match. Also, strongly recommend using a 7-8K resistor for R9 instead of the 10K that is specified in the BOM. I wasn't able to bias one side high enough with that 10K resistor.
Excellent kit! My F4 works great! Thank you!
Excellent kit, service and delivery . Now working perfect in F4 .
While repairing a channel in the F4 I had to unsolder and solder several parts repeatedly.
The board survived a hot iron. I've seen other boards come part after a single unsoldering of a part.
Having the mosfets matched in advance is a times saver and worked out well repairing a F4 channel.
Excellent boards. Installed all components, biased up and working 100% and dead quiet
What more can I say? Support the site!
As always, a great product from the Store.
Great service! Parts arrived very quickly with everything accounted for. About to start my F4 build! Thanks DIYAudio Store!
Rob G
Great to have matched mosfets.
Hello , I received the DAS 10469 with the delivery time indicated by your site. I didn't install the transistors yet but every thing seems in order. Concerning the DAS107 07. I still didn't received anything
The amp itself is brilliant design!
PCBs are of excellent quality and very easy to work with.
Though a couple of improvements can be made: bigger diameter of resistor leg holes allow to install high quality resistors like 0.5W Shinkoh or Takman. Also it's better to bypass electrolytic caps with film and mica caps, so place for one (or better - two) bypass caps for each electrolytic should be great addition.
I first bought an F5 kit from DIY audio store. It was an awesome sounding amplifier but I felt it had too much gain for my system (I have very sensitive speakers). I then got the F4 amplifier PCBs, that I could use in the same chassis I used for the F5 (I had to augment the PSU with another board for more capacitance). The F4 is perfect for my system, I don't have to listen at very low volume setting anymore butt I still do have plenty of room to increase volume if needed. The sound is great. The F5 has exceptionally fast transients and a somewhat lean sound with tons of details. The F4 has a more relaxed presentation, not as fast as the F5, but I felt the sound has very wide soundstage, and the details are still there. Very enjoyable to listen to. Overall I am very happy with this amp, that I know will remain in my system for a long time. I am very pleased with the service from DIY Audio Store, and the quality of the PCBs and parts they provide. Thank you!
Great service.
Got transistors and boards in four days. Built amp boards and power supply. The back panel kit didn't get restocked, so I bought parts elsewhere. Used 4U Deluxe Chassis. Comments on that under its heading. Worked immediately on power up.
Everything was ok, fast shipping. Highly recommend.
Excellent products. Fast shipping.
This time my shipment was held up at Indian customs for a while & I received the goodies on 14th Feb 2K18 (Had to pay a hefty customs duty)
No complaints about the goods though! Excellent quality & good packaging as well. A big & hearty "Thank You" to all at DIY Audio Store - MM
I received a refund for the defective transistors. DIYaudio was very understanding. I think my experience was just a bit of bad luck.
Appears to be correct parts. I have not even broke seal on package yet. Likely not starting until winter when I have more spare time. Lots of parts needed on site not available at this time so I will be patient.
I've built a bunch of stuffs starting more than 40 years ago. An with these pass projects things just keep getting better and better. And easier and easier. I don't want to miss lead you, I build tube stuff too, and really love them. They are awesome beautiful art works, elegant and unique. Instruments of music, not reproduction. They make music. Sand amps though, - they are different, and you gotta accept this, but then guys like Allen Wright and Nelson Pass come along, and they've change everything, - for the better, more artful. And this is the accomplishment of our time, to bring back art to this increasingly artifical man-made world. And the more of it we make the not so always better. Man, the times I was born into, guys in the bowery were throwing shit on canvas and calling it art. Well we changed that, now its a wonder to see and hear also again. I've seen art, real art become Ordinary, and I've looked on as we become more artful, and creative without animus, with pathos or love or our collective identity in mind. It makes me wonder if Barack Obama is really John the Baptist. IF so the man is on the way, let the trumpets roars, the Man is on his way. Anyway when I am listen to these amps, the F4's I can think of these thing and ideas together. I can wonder and dream, and can also think the thoughts that can recreate the dream on earth. Both ways are valid and in the right frame of mind together they are a bit of heaven on earth.
fast and as expected.
The quality of PCB is excellent