Constructors, have you assemble some forum amplifier, can you post it here?

[jpnascim]

Originally posted by destroyer X
It is fast to recognize a brazilian diy amplifier.... space between parts, simetry...hehe...very nice.

Could you find solution for your noise?

Sagarverma is without answer.... very interesting the guy...in your thread!

How is this amplifier sound...your subjective description and some information referenced in something already known by forum constructors will be interesting.

Yes, i know you have not too much time...i will be waiting with patience.

regards,

Carlos

Thank you Carlos ! I've many mistakes but I was quite satisfied with my results. But I will try to do better next time !

Well, yes, I would say that I've solved 95 % of my problems with noise but I couldn't get any better. I've used a ready layout from the book and I've noticed that it mixed rail decoupling grounds with feedback and other "clean" grounds, which is condemnable.

About its sound... Well I like it very much. It is precise, clean, appears to have no coloration. Since it is very fast it reproduces fast transients at loud levels showing no signs of distorion.
I've crudely measured its frequency response and it is almost flat (stays within +/-0.3 dB range along 20-20Khz band ). Because of that and the non linear nature of human ear, it can sound a little dull when playing at very low volumes (Fletcher-Munson curves). I am planning to add some tonal controls to counter this. This is the only issue. Everything else is fine: drums, guitars, pianos, voices and etc sound (to me) the way they should.

What I find really amazing is that this Slone Amp I've built (Design 3 from his Audio Amplifier Construction Manual) is really really similar to the Self's blameless amp which everyone appears to dislike. But a good number of people (including me) like Slone's amps.

Best regards,

João Pedro

[destroyer X]

Was interesting hear from you about the amplifier sonics, as i know your home amplifier, so i can have a reference for better understanding what means this modern amplifier related is performance.

regards,

Carlos

[lgreen]

Mr. Destroyer-x, I have read many of your posts, and emotionally have gone from disbelief/amusement to being very confused at your wording, and now I actually think that you might know what you are doing. Clearly you are a big hit here at diyaudio.com, an impressive and very good natured personality.

Here is a link to my Krell clone, please look. Perhaps someday after I learn more I can convince people that I am not too bad at this.

link

[destroyer X]

Yes, amusement and strong deception....yes, you are rigth.

Your work is wonderfull, you may be one of the best we have, and really humble is not adequated to your work.

It is so good that you may feel pride...as that construction quality are not common.

Congratulations Doctor Igreen..... related assemble, a Doctor!

regards,

Carlos

[destroyer X]

Will visit your place to watch more images in details..... i will also save your images, and some will be printed to my audio wall.

regards,

Carlos

[destroyer X]

And all them different.... some of them may match your needs.

I am just waiting to his OK to publish his amplifiers.

regards,

Carlos

[EWorkshop1708]

Holy SH!T that amp looks good!

How many watts is it?

What output transistors?

How much uf Capacitors?

[EWorkshop1708]

I'm building an amplifier that I plan to output over 300W @ 4 ohms. Maybe 400W if I get a big enough trans But right now just testing with ~ 200W transformer. 5 pairs of MJL4281/4302 CFP. Amp goes down real low freq, 10uf input cap, 63K input impedance, direct connected speaker.

I built a 50W amp @ 4ohm, using ~36V ~80W transformer from an old 70's amp, (single supply) a year ago using old parts, and 2N3055/MJ2955 outputs and a large heatsink, with 2 80mm comp fans, and put it in a small blue cardboard box. Heatsink never gets hot, but amp plays hard. CFP output, 2200 uf output cap. Bass is strong even for single supply.

I'll post pics when I get them loaded.

Destroyer X, do you agree that it's more fun, and better to build yourself because you can taylor amp to your needs, than getting a consumer amp?

[destroyer X]

costs can reduce enormously final quality.

For instance, the use of two transformers, 2 independent supplies produce more power, and better channel separation than the comercial units.

Doing by ourselves we can decide by quality, even if this represents cost increase.

Also the choice of personall preferences...my case i love analogue power meters, and also i do not forget to install some peak power meters, using LEDs.... and comercial units, may have one kind of metering of other, beeing less common to find both.

The pleasure that we can have doing our units are something pleasant that last longer than unpacking comercial units... and those, in many cases, are very deceptive in sound reproduction.

Please, post your images, beeing together in some posts, will be easier to view, without open all forum threads...and there are many guys that loves pictures, selecting threads to visit because the image quantity....my case!

regards,

Carlos

[lgreen]

Originally posted by EWorkshop1708
Holy SH!T that amp looks good!

How many watts is it?

What output transistors?

How much uf Capacitors?

If its mine you are talking about, check this link for all the details (more links on the link as well). Questions and comments can be put there.

Lets see some more amps, don't let the photo thread in the tube forum show us sold-staters up!