Zen Mod

that was just pointing that I don't care and it's not imprtant what you are measuring at Q6 - if you have -11V to -12V at bases of Q2 & Q3 ; in that case LED string and Q6 CCS are serving their functionif channel is working - then they are functional , so you don't need to check them there - voltage check points at schmtc are good enough for purpose

what's important regarding Q6 is just voltage at bases of cascodes - Q2 & Q3 ;they must be in range of minus 11-12V - exact what is voltage drop across leds+1N string

:dubbio:point is that upper jfet is open but lower one isn't , so you are having same offset as in case that you have high value resistor instead lower jfet , while upper one is trying topump current through it .I can't figure how on earth - what's stealing current from R35&R12 combo ; is Q4 OK ?with positive offset on output - it will be logical that Q11&Q12 are sort of choked and that Q9&Q10 are conducting more current , so you should have greater amount of voltage across R35&R12 ........ but not - here is contrarycheck Q4 please

ako je regionalno podesenje stavljeno na serbia , dovoljno je samo promeniti zarez u tacku - kao decimalni znak

have you continuity between R32 (not jfet side but left side on schematic) and C of Q2also - check continuity between R32 and Q14

kolegi svaka cast !

steine - prosledi datoteku Daudio - zaboravi na moj PM - red je stafetno

OKtry to preset - in cold ( prior to powering up ) sum of R12+R35 to ~250Rthen try standard procedure with variac

Tea- let me know ( probably again , so sorry ) - what's Ugs/2A of outputs used in that broken channel ?

:angry27:nisam ja velik moj Fullrange Bro je still veci od mene , kako god okrenes ( i sa koje god strane pogledas )

ma ja sam ti samo matori corava koka zrno ubode , makar i kvarno ......

za decouple stavi sta hoces - bitno da je min. industrijski kvalitet, a sto se tice nfb - nisam bas sasvim siguran sta ce to tumislim - to je varijacija klasicne Hitachi application note seme , a to je radjeno i sa cap-om u nfb i bez njega ;ok - stavlja se da bi amp bio foolproof-niji ....... sto cisto sumnjam da ti je neophodna f-ja

imam kuci set izvucen iz ostataka MIG-aako se setim - mogu da pogledam koje to nisu za jednokratnu upotrebuinace - preamp napravljen sa cevama iz elektronike meteo balona koji je doleteo iz ruskih visina do nizina drevne Backe radi i dan danas

simple said - complementary and cascoded is simply better ;in fifi vocabulary - less sonic signature tech speaking - lower output impedance , works in constant voltage regime off course - choice is all yours

cisto da nas podsetis na samo jednu sposobnost zbog koje nam nedostajes

izbunari triodne k-ke , pa da vidimo

svaka cast na trudual' da ne lici ni na sta ........... ne lici .

sta se desava kad stavis dodatni par tranzistora ?

pa nacrtaj obadva pa razmisljaj o worst case i koja je verovatnoca da do njega dodjemislim - kako god okrenuo - izacices na iskustvene metode ......... i zaboravices na crtanje SOA

dye temp ti je 25C samo dok ne ukljucis uredjaj

par zescih Off premesteno ovde : http://www.diyaudio.rs/topic/962-udrobljen-off-topic-skladiste/page__pid__53297__st__165#entry53297 ZM

kjucic ?

e nek' si mu rek'o .......

.... precioussssssssss:Viannen_loungelizard: