Bora is a nice guy from Serbia - Yugoslávia

[wintermute]

I believe WES in Sydney still have BF469 and BF472 (higher voltage but otherwise same as BF470) I bought 30 BF469's a while back. http://www.wagner.net.au/

futurlec also has BF469's but they don't have bf470's or bf472's

Tony.

[zeonrider]

Ma dobar je Bora , samo kad je dobre volje i kad ima neke koristi od toga. Seti se Boro seme PHASE LINEAR koju si mi poslao. Ja sam mislio da si ti neki naucnik u pogledu audio elekrtonike, a ti si obican skljupac sema i dobar AMATER.
POZDRAV SVIMA

[boraomega]

Originally posted by Samuel Jayaraj
Bora, your Goliath amplifier is a straight adaptation of Elektor's Crescendo amplifier. I wonder how it works at all, since you have used vertical mosfets and there is no Vgs, or Vbe multiplier or any other temperature sensing mechanism at work. If anyone has every tried this amp practically, thermal runaway should have occured some time or the other. Any explanations?

The other designs look great. Perhaps I'll try them out after I have finished with the GEM (testing prototype in two hours time!!)

Thank you Samuel for noticing that mistake, and I apologize to all others too. Frankly, I never noticed that I typed IRFP models instead of 2SK1056/2SJ162 and that schematic (with a mistake) has been on my site for last few years. Disaster! Without Vbe multiplier, IRFP's would certainly have a sad destiny! Hopefully, anyone with experience will probably immediately notice another clue: bias trimmer is only 250 ohms and knowing the threshold voltages for opening IRFP's, will realize that current through drivers would have to be almost 300mA to produce necessary voltage drop for both sides.

The schematic is very similar to Crescendo (as well as at least a few dozen others one could find all over the WEB) which is one of more or less generic topologies well known and widely used.

[boraomega]

Originally posted by zeonrider
Ma dobar je Bora , samo kad je dobre volje i kad ima neke koristi od toga. Seti se Boro seme PHASE LINEAR koju si mi poslao. Ja sam mislio da si ti neki naucnik u pogledu audio elekrtonike, a ti si obican skljupac sema i dobar AMATER.
POZDRAV SVIMA

Ruzno... bezobrazno... i nicim zasluzeno!
Bilo bi posteno da se jave svi oni sa kojima sam do sada kontaktirao samo iz ciste koristi...

[viktor1986]

JA NE DOZVOLJAVAM DA SE BILO KO NA TAKAV NACIN OBRACA BORI.BORA MI JE MNOGO POMOGAO U "SAZREVANJU" U OVOJ OBLASTI I MNOGO MU SE ZAHVALJUJEM JER SAM DOSTA NAUCIO OD NJEGA A ZELIM DA SE TAKO I NASTAVI.JA SAM DO SADA URADIO BORINO POJACALO STUDIO I UNIVERSAL I OBA SU PRORADILA.STUDIO JE PRORADIO IZ PRVE I BEZ GRESKE JE SVIRAO I DAVAO LEP ZVUK.KAZEM LEP JER NEMAM KVALITETNE ZVUCNE KUTIJE KAKO BI UTISAK BIO UPECATLJIV.

Sve u svemu,svako ko napravi neko Borino pojacalo se nece pokajati.

[planet10]

Originally posted by destroyer X
I am afraid that Servia can be something very bad.

Or something very good... an excellent race car driver...

dave

[sardonx]

I was going to say something about the "Servia" thing.. but then i thought hey maybe that's how they say it in Brazil.

Also... there is no accent on the 'a'. We're not French

[viktor1986]

I made boraomega Studio amplifier and I am very pleased with sound. I strongly recommend you too built this HI-END amplifier. My friend has also built Studio amplifier. Soon he will post those pictures’s here. I made also Universal amplifier but with IRFP240 and IRFP9240 instead 2SK1058 and 2SJ162.You can found something more if you click here http://www.hifi.co.yu/forum/viewtopic.php?t=551

I am currently working on Legend amplifier but with 8 IRFP250.

POZDRAV SVIMA.

[jacco vermeulen]

Originally posted by sardonx
I was going to say something about the "Servia" thing.. but then i thought hey maybe that's how they say it in Brazil.

You mean Brasil.
Don't make fun of Carloz.

[boraomega]

Here you go Carlos... Do you see what those youngsters are prepaired for... and with older members...