Bora is a nice guy from Serbia - Yugoslávia

[boraomega]

Well, I am so glad to see one more enthusiast somewhere in the world trusting my design and building it for pleasure and pride! That is the paramount prize a designer... at least it is for me... I am not an "American dream" follower!

Yes, you can use TIP35C/36C for initial ("quiet") power-up just to see if everything is OK. They will probably survive all but hardest tests on full power and with significantly reactive loads! For later, permanent use, I will suggest slightly better, more modern and more capable components of the MJL4281A/4302A or MJL21193/21194 class.

Keep us up to date about your progress and listening impressions! All the best!!!

[destroyer X]

I hope you are healing and fast.

regards,

Carlos

[alex mm]

Hi again , thanks for your comment and nice words Dr.Bora , also to mailing me , the corection regarding final stage , especially resistors mounted with output coil . Certainly I will use , all ready bought MJL21193/21194 transistors . http://tinypic.com/view.php?pic=6hgxcad

[fotios]

[QUOTE]Originally posted by boraomega
[B]Well, I am so glad to see one more enthusiast somewhere in the world trusting my design and building it for pleasure and pride! That is the paramount prize a designer... at least it is for me... I am not an "American dream" follower!

Mr. Jagodic, because so many fuss exists the last month about the practical application of your LEGEND amplifier by our friend Sakis from Greece, i tried to give a help by redrawing your original plan which posted to me by Sakis before one month. I ask your comprehension for my intervention in your intellectual property, but the drawn under this manner it is a standard in audio amplifiers theoretical design as you know, to be easy comprehensible. I hope to not be angry with me, and i ask - if you have the kindness - from you to confirm that the values of components and the circuit nets and nodes are connected correctly in my redraw.
Kind Regards
Fotios Anagnostou

[boraomega]

Hello Fotios!
I can confirm that your drawing is correct except that you added 4 resistors of 0,18 ohms (not existing in my schematic) of which two are correctly positioned in sources of upper units, but two lower ones are in drains ?! They won't be of much use there. Visual analogy to complementary configured output stages is not enough to provide functionality and right purpose.

Regarding all that "fuss" you mentioned, I decided from the first moment not to comment anything. My friendly extended hand and help I gave from my heart from the first contact, were "turned" upside down, many things were misinterpreted and published that way, my design abused without even minuscule intention to ask for my permission (at least!)....... Hence, I don't see a point of any further involvement in any way!

[sakis]

in this case ...and given the opertunity i would like to apologize for saying ((that you gave up on me )) cause i didnt know that you where in a health contition ......

yes this my mistake and i apologize but i didnt know ...never ment to mean bad to you in any way .....

also given the opertunity i dlike to say that with the help of all the wonderfull people of the forum legend 4 and 8 is getting very close to work in rails above 60 volts also .......mainly not only producing a lot of poweronly , but also keeping all these wonderfull sonics the certain sweetnes in high but also ( most importsnd for me ) to be able to stand avery good ammount of abuse while running in small pa application which was my original target...

see dr Bora i could just as well turn to any other cirquit that meet my standards but the thing is that i liked the circuit very much i like the way it was given to me i like the way its made i like you actually ....so the thing was, that if me or you missed in the way that my rails were curently 62+62 volts .....just never mind ....with a touch here and a touch there ..... we are getting very close to solid results

best regards and thank you again anyway

sakis

[fotios]

Originally posted by boraomega
Hello Fotios!
I can confirm that your drawing is correct except that you added 4 resistors of 0,18 ohms (not existing in my schematic) of which two are correctly positioned in sources of upper units, but two lower ones are in drains ?! They won't be of much use there. Visual analogy to complementary configured output stages is not enough to provide functionality and right purpose.

Dr. Jagodic, as Sakis Petropoulos says there is no problem with our original design if the supply does not exceeds +/- 45Vdc. But Sakis wish to use it in P.A. applications thus the supply must exceed +/- 65Vdc to take an output of 200Wrms. And the problem is there, because the instability caused. Our original design with so high supply presents a d.c. offset of -200mV and during operation the swing of output goes more negative. Also the Mosfets are very sensitive in accidental pluggins or unplaggins in the amplifier's input. I don't have experiene with mosfets and quasi complementary outputs, but mr. Nelson Pass suggested to remove the diode so the output goes more positive. Also, according to your suggestion i removed the source resistors in their correct place (as mr. Pass said to me, these resistors are indispensable for the proper sharing of current). To resolve the dc offset i proposed the VR1 between the emitters of difference amplifier transistors. Also mr. Pass propossed the 2 zeners in this place shown in draw exactly to protect the gates from unwanted spikes. And for a more symmetrical output swing, according to an app. note of RCA i added a driver 2N5551 in the upper pair of mosfets. But i am not in possesion to confirm that this circuit works. Can you please throw a glance in the modified circuit quoted bellow to make your comments or your suggestions before its posting in the thread "Mosfet protection diodes"?
Kind Regards
Fotios Anagnostou

[boraomega]

Hello Fotios!
Knowing that you and your companion already got some of the biggest names in audio world (Bob Cordell, One and only-Nelson) to help you, it will certainly looks very immodest from me to say anything more. Like everyone else, you people are free to play and modify any schematic for your personal enjoyment and exercise, but that what you can not is to make 30 amplifiers without at least asking designer for permission, regardless of fact what are they intended for! It is clearly stated on my site that I am giving Blanco permission to anyone to build any of my designs freely but for personal use!
I’ve been asked for small, simple, cheap 120-150W amp for personal use, and that is what I provided. For anything further I really don’t have time and will in this particular case!
Any further modifications are of course possible, but then everyone would normally expect that such courage to modify one design should be supported with sufficient knowledge and experience.

[destroyer X]

Try to imagine if you have an schematic....you offer to public use..someone ask your help...you give the help you could...and then you turn sick.

People feel abandoned and told that was abandoned (already apologize).

Now someone publish a re-arranged schematic you made..something you have tested and worked....now people re arrange for better.

Of course Bora not happy...if you intend to cooperate with Bora, you could send it to him directly...not to post to International forum...published to mankind.

This seems to be a deliberated persecution, something very bad in my point of view.

This insistence to cause some damage to Bora image is something i cannot understand...as this is a payment to Bora's attention with a knife in his back.

I do not know how things runs in Greece...but here, down in South America...we...not developed people, we know how to react against those things.

If the idea was cooperation why to post?....are you cooperating with your own intentions...not with Bora.

Every amplifier is tweakable....this is not showing you as clever....as those obvious things are already into Universal knowledge.... what is not Universal is that bad behavior to persecute someone had helped Mr. Sakis.

Yes....you will tell that i misunderstood...that this is a cooperation...hehe....people are not idiot.

Also, remember that you represent your country here...the country image is something that is in your hands.

regards,

Carlos

[boraomega]

No Carlos, nothing continues... nothing ever will... I am just attempting to put things, issues and people where they belong...