Zen Mod

Sinko , ovaj sinko ........ osecas li ti ikakvu odgovornost kad pises , da mozda neko naivan jednog dana nece citati , pa nauciti bas svasta

nije iskra

pile tatino

a jes

nabavi oval iskre pun ih kp

v......o........l.........v.........o sto cudno pise BMW

spajkovi/lancovi?

I forgot to write SuperSymmetry/SUSY anywhere on pcbs , but I didn’t forgot what’s more important: Did I said that they’re Gorgeously sounding ?

Few more pics , with lid on , and even with USB stick as size reference thingie: Some technical stuff: -Donuts : I ordered 900VA made on 1K2VA cores ; later -when actual winder guy itself contacted me to confirm few things , he said – do not worry , it’ll be 0.9T … they’re having static shield and outer tape shield . -Bridges are Big. -Each rail filter consisting of 90mF-0R11-90mF , resulting in 23V5dc. -Iq smidge above 7A , resulting in 100W/8R , 80W/4R , Winter blessing being in range of 360W per box. -Relative offset wandering some 25-30mV from stone cold to hysterically warm (top of sinks being 17C above ambient). -Absolute offset frozen around -350mV , right from powering up , all the way to hysterically warm. -Iq change around -4% , from stone cold to hysterically warm. -No power on thump , while power off thump is no more than small plop , even on my LC1B , they being sensitive on air flow induced by cat crossing next yard …… -Weight – smidge above 60kg. And yes – there is additional pair of drek binding posts at back , accepting any Remote Power On/Off voltage from 10 to 35Vdc, polarity irrelevant.

Now , if you take a look at Eagle front End schematic and Eagle Front End pcb screenshot (4th and 5th pics from top) said resistor positions are R3 and R53 , with R3 being position of our special interest : My taste dictate R53 being 1K , and R3 being 1K2 ; for anyone else’s taste , all what’s needed are few different resistor values and pincette/tweezers ; just power amp off , pull resistors out (gently,please) and push new one in (gently again , please). After that you can power amp on , or go out for beer and some talk , I don’t care

Now , few words about THD spectra shaping ; Papa taught us during the years several tricks how to imbalance that perfect Symmetry (ironic , isn’t it …… working principle of amp itself is called Supersymmetry/SUSY , while we are trying to spoil it . Anyway , we want some sugar , and we are getting that with 2nd harmonic above 3rd ; again – Papa’s Lectures – some people prefer that way (Tubelovers?) , while some people prefer dominance of 3rd (Sandworshippers?). Further – we can divide both of these groups by polarity of dominant harmonic- some prefer negative , some prefer positive. What can I do regarding that , except to find how (hardly first one knowing that) and then organize easiest way of doing it …….. If you take a look at LTSpice schematic of amp (third pic from top) , you can see two resistor positions circled in red. These resistors are path to modulation of Aleph CCS-es and their values are directly defining amount of that modulation , thus defining amount of Aleph CCS-es contribution in output signal . So , simple ; disclaimer – my goal is to invoke 2nd , and control it’s polarity and amount : -If these two resistors are same in value , there is greatest amount od symmetry , resulting in zilch 2rd ,dominant 3rd. -If we increase value of said resistor at side of positive output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being negative phase, -If we increase value of said resistor at side of negative output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being positive phase. That’s it . How it is organized in vivo ? I had idea to introduce sort of already know device among Greedy Boys , called -ZAP (Zen Amount Pot) , but later decided that would be impractical , and probably leading to constant play with , while forgetting enjoyment in music …. so I decided to use pin sockets/or whatever their name is , in said resistor positions , thus allowing easy change of resistors in situ , without involving soldering equipment etc.

zameni to sto imas i ne diraj ako pokazuju isto kad privedes mono signal , to je to za pravilno podesavanje trebao bi da imas osciloskop , dovedes amp do klipinga ( ne mora i bolje da nema load na izlazu za to) i podesis led bar da safatava crvenu

kad porastem ......... bicu Ninja !!

srecni putevi! ne zaboravi rezervne gace i nakurnjak!

nije fora stavljas sta imas u ovom slucaju narucilac je imao ovo , to sam i stavio Fata je Fata , al dvaput je dvaput

mene nekako srce uvek na tu VoT stranu ........

sve je pitanje konteksta ....... dakle ako je naponski swing takav da ne drllja mnogo po prenosnoj krivi ..... da je promena primarne velicine ( da li struja da li napon) relativno mala u odnosu na postavljene vrednosti u radnoj tacki ...... mozes reci da je sistem linearan dakle - kad pojacavas MC signal , mozes da uzmes ceve sa mizernim strujicama a i naponima ( zanemarujuci sad sve ostale faktore) , dok za driversku ceve koja treba da swinguje ihaj volata (a bogami i pokoji mA)....... mora da bude i mamara ceve

linearnost ........ jedno je linearni rezim rada za elemenat , drugo je linearni rezim za grupu elemenata ako stavis mirnu struju recimo na 250mA po tranzistoru, i zahtevas od njega da jarca +/-100mA ........ to je jedna stvar a ako stavis mirnu struju od 2A po tranzistoru , i zahtevas od njega da jarca +/-2A ........ to je druga stvar sa druge strane - temperatura nema nikakve veze sa tim ...... ima posredno , ali sijaset drugih stvari su pre vezane za temperaturni domen

evala

upravo tako bias je 350mA po komadu/vertikali

razdelnik napona se podrazumeva ...... ono sto mene interesuje je mahom kako se ponasa sklop na 1W , te koliko se to poklapa sa simuliranim (kad je u pitanju prethodno simulirana konstrukcija) preko toga retko kad me intereuje bilo kakvo merenje koje ne ukljucuje osciloskop merio sam samo prototip pojacala - to sto jeste napravljeno ali sa samo po jednim izlaznim po kvadrantu ....... interesovalo me i da potvrdim koncept servoa kao i igrarije sa THD spectra to je sve bilo konzistentno poprilicno sa simulacijom avaj , pobrljao mi hard u radionickom kompu , te nemam sacuvane screnshots , kao ni sacuvani moj config file za EMU a sad vala nemam ni zivaca da ponovo setujem EMU (komplikovano do bola kad ima previse svega) nisam ni merio finalno , ne interesuje me

EMU1212 ima bal in i bal out no , ako nemas balansirano konverzija ili aktivno ili trafoima pod uslovom da se igras sa line level signalima , nije kriticno

editovao semu gore , da bude malo vidljivije

pa da , starija ..... moze biti sa slabijom emisijom a i ne mora ono - napravis skalameriojicu da testiras sa porilcnom strujom i manjim naponom , pa izbiras koja je najplavija