Explendid amplifier designed by Michael Bittner, our MikeB

I think we are giving much more atention than this guy deserves

Sheldon, very clever and diplomatic, i thank you to help me, as those dark clouds often cover our skies.

Also i thank you Mike, but i conclude that i am giving too much atention...let he say what he want to say, i will be answering only the ones that a long time show friendly atention with me.

I also cannot face this guy, as i do not speak a good English, hehe, me indian, me good...and this guys is holding my feet because of terms.

He may be unhappy, and try to make us unhappy to... he is comdemned to erasure...i will not read his text anymore, but will be reading all your words, other 20K gentle guys.

This one discovered our forum to use as a trash box, in my idea, one day he will be lonely and will change his actitudes.

In the reality, i was so bad as he is.... i am sorry, as i made many bad jokes with him.... but he may eated the sausage...ahahaha!

regards,

Carlos
 
Oh!...you remember that.... very funny sittuation.

I cannot remember Bill Pinton and Bonika lepinski under the table.

This made me laugh always, in special because the puritans scandalized.

Something common, but beeing a Resident of a nation turn things very strange.... we can...but he can't.

those funny events for the History.

Me Indian...sometimes this is very convenient.

regards,

Carlos
 
Thanks Carlos. And thank you for your upbeat attitude. It's been my experience that happy people are that way because they choose that way. Most everyone has external circumstances that they can dwell on if they choose to be unhappy. We can make our little efforts to show another way, but the choice comes down to the individual, as is their right. Yes, some people have lives so hard that happiness is almost impossible. I hope that doesn't apply here.

But, back to Mike's question about silent constructors. I've got most of the parts to make the amp, and I will. I expect I'll fit it in over the next couple of months while I work on my speakers. It'll be monoblocks to be next to each speaker. I'll need a good low impedence pre to drive fairly long interconnects (6 or 7 meters). So I've gotta come up with something there too.

Sheldon
 
I feel myself very lucky, as almost daily i found people alike you.

And in this forum are many very sensitive guys, with extremelly high inteligence, experience of life and enormous tollerance related my own failures.

This week i had three personal mails, people trying to be more close, and those things i accept, always, with my arms completely open, as all of us feel some loneliness, because of we live very separated one each other, having some afraid of our own shadows...some modern life consequences.

Some guys arrived in my mail box, inviting me to "sit around the fire"...to have a good conversation, alike brothers, talking real things without the shield we normally use, to protect ourselves.

I love those frankly conversations...true words, and between 8 good friends made by internet, only one give up to be with us, but because some organic problems that turn his emotions bigger than normal...we are going ahead, talking real things, alike good brothers, in our virtual friendship that has only the distance as impeachment to transform that in a non virtual relationship.

Lucky i am, because those guys that arrive, are always people better than i am, knowing more than i know, and all them pushing me up.

Observe those examples, Michael, Hugh Dean and Graham Maynard, and the mains ones, because knowed in this forum..there are others so good as those ones, but more shy, with some hidden brigth, some Brasilians, Canadiens, French, Argentine and USA.... all them sensitive persons.

I thank you by the message, the diplomatic example, the tollerance proved to be efficient.

Was good to have you here.... stay with us here, please.

I am sure, Michael is smiling showing all the teeth he have...he told me many times, that feel very good when he can share his good amplifier with other guys....and you assembling, is at least...W-o-n-d-e-r-f-u-l-l

regards

Carlos
 
Well, i finally found the text Michael send me, explaining how to "prepare" Symasym4

To be used to reproduce bass....here is his text:

" that's no problem to extend lowfreqresponse for symasym, just increase inputcap and the big
cap in feedback. Let's say, 22uf or 47uf for input, and 1000uf for feedback ! Now i use 470uf here.
For input i have 4.7uf, using 10uf here already extends bass. (10uf filmcap is DAMN expensive)
But i do not want to kill my speakers, i already had +/-~1cm movement with the digital canons
from tschaikovsky, was a painful hit into the stomach... I loved it !"

Some friends asked for that, i think was Barry, or maybe La fontaine...but one friend asked instructions to adapt to use this way...i will search to find the ones that asked that.

regards,

Carlos
 
TLF9999

Hi

I know of an amp with a GUARANTEE of very low distortion
in a resistor and it is called the BLAMELESS!!!
It is a guarantee from a doctor!
This amp is for you tlf9999. Great spec...but the sound...

tlf9999 is embarassing Graham on the JLH thread... 🙁


Have a good day :eguitar:
 
Oh!..poor Graham, so good man, and having family health problems, and that boering

Situation to face.... those guys disturbing, it is easy to disturb, difficult is to maintain things running with harmony.

One damage apple in a basket, easy destroy the others.

We have to wait the guy turn tired to disturb our good friends.

At the moment i could recognize two, clearly decided to detonate the forum, finding arguments to discuss, or details to dennie afirmations...provocating us, clearly searching for figth, and in a coward way, as do not do that inside the range of the long arm of some justicer.

We could put our hands over some guys alike those in the Ham radio... they were left nude in the middle of our main street, and of course, Police was called.... we do not hit them (they were three), as complications with our Police is enougth.

I am sure forum moderators already turn their cannons against those guys, just waiting they broke some forum rule to receive an unforgeatable gift.

regards Dragondeux

Carlos
 
Hi htrinkle,

The p3a is for sure a very good amp, especially regarding partscount...

If you have difficulties with some parts, here are some possible
substitutions:

mpsa18: bc550c,2sc2240,bc546b these should do the same job...
2n5401/5551: mpsa92/42, bc639/640, but i i recommend to keep them.
mje15030/1: better not to replace...
output: every highly regarded bjt should do it, sanken, toshiba,
mjl21193/4/5/6...

I can post my layout for symasym4 if anyone interested, for symasym5
i have no layout yet... (i modified a symasym4)
The layout would not work to good with the sankens...

One important thing, the drivers (mje15030/1) must be mounted
on the heatsink, they are heavily biased...

Mike
 
This one is first Michael's suggestion, 200 watts over 4 ohms.

This one i did not assembled....and i think i will not, because i am more interested in 250 watts over 8 ohms.

My idea is simple.... 30 watts i feel as beeing good.....twice of that, 60 watts will be perceived as some increase...double again.... 120 watts will be more perceived as power increased...and once again....240 watts will be perfect in my mind.

I mean, three perceptive steps of increase, as we normally do not perceive diferences alike 30 to 45 watts..... almost the same...the speaker perceive...but i do not!

When Michael produced the one i am asking him, we gonna construct together.... we will share our opinions about, they will be compared to the expensive Yamaha he has, i will compare with my class D, will compare with AKSA, will compare with GEM, will compare with Symassym4 and will compare with JLH 1969 design and also with DOZ.

If the amplifier appear to be good comparing with those...yes, can loose here or there, but not loosing too much, will be aproved and "guaranteed", based in my own honor and Michael's honor, that force us to be true with all forum guys, the informations are something you can trust, as the unit will be good to hear, something that you can believe that will work, and that will not sound not too much worst than those Magnificent ones i told.

Of course all this is subjective, as i am not a computer, and i am not a distortion analiser, and even i am not a spectrum analiser...so the unit can be terrible to some guys...as even JLH designs can be bad to some guys, in my idea those guys are too much exotic related their music preferences, and may have some screws loosen inside their brains... or, they can be rigth... i can accept this possibility as something very remote..but i can respect this.....more or less....hummmm, very hard to respect someone that do not like JLH!

Almost half of forum guys aproved JLH as something very good, a Aksa has thousands of units sold, and i could not heard any customer talking bad things about it....GEM is a product, result of more than 10 years of research, and the man is a Scientist, that honored us with his presence and humble personality, giving atention to all guys, including the ones that enter to create problems, and to dennie even that the sky is blue....using some bad arguments alike:
- "bad weather turn the sky gray"...those guys, very feel they are...need some protude object under their motorcicle seats, maybe, to turn them more confortable, to be waken up in a long travell, or even to perceive how hard is the reality...having their medicine to themselves.

I repeat, to the ones that have some confidence on us, and my group of friends that help me to present myself have: Hugh Dean from AKSA, have Graham Maynard from GEM, have Michael Bittner from Symassym, have my own dirty boards, have support of many good guys, as Carlmart, Gilles Drolet, Sheldon, Barry Husbands,Greg Erskine, La fontaine,Jacco Vermeullen,Snuberized FM,JPenteado,Palesha,Barry Notifyme,Noel,Workhorse , and many others that can produce enormous list, to the ones, not written here, my apologizes because of my week memory.

The guarantee, and care to test the things designed, are done to those guys already listed, and also to be fair with all forum guys, not to let them construct timing bombs.... guarantee that they can have confidence, that if something works bad, they can trust in us, and check their components and construction, because it is guaranteed that the mistake have to be made during the construction...the amplifier is guaranteed to operate, and working very well, and i am confident that you will apreciate it very much.

The guarantee cover that the amplifier will work when correct constructed following the schematic, that will sound good, very near the most famous forum units made with BJTs, and that will not present problems related stability, heat and burns

Here is the Symassym5 schematic, modified to 200 watts RMS over 4 ohms....not constructed, not tested, and not guaranteed for a while...this one, it is your own risk to construct...and that sittuation is for a while only, as we will appear with a hard tested unit near future.

regards,

Carlos
 

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Michael told me to produce those 250 watts over 8 ohms, will need some lethal

Will need some lethal voltages...and he do not want to be responsable of someone that can be severily damaged because of that.

We agreed in 250 over 4 ohms....i expect this can be good to many guys..... 125 over 8 ohms.

To avoid so big voltage.... i think he have good reasons, and this shows how serious this guy is.

regards,

Carlos
 
When i need higher and not commom voltages, i use this circuit.

Modified from a Sony Videotape machine, used in early seventies...was hard tested, and almost 50 supplyes alike this one where made and sold by me.

Normally they are produced not simetrical and to 30 amperes and 13.8 volts, to Ham Radio equipments.

I have not informations of problems with this circuit...maybe some resistors can be changed for higher values, to be more safe.

regards,

Carlos
 

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