Zen Mod

ene, napravljen je i SissySIT R.4 
promene su - jos stabilniji Iq u dinamickom rezimu, kao i kompletna DC sprega input-output
primenljivo za sve skorasnje ampove sa identicnim FE
no sacekacu jedno godinu dana sa objavom, dovoljno sam se u nogu upucao vec sad
 
.... sta - nogu ..... obe noge ...... 

pominjanje "najboljeg" mi izaziva osmeh, dok cekam da se brew prva jutarnja
to ti je kao da kontempliras koja je zena najbolja ....... dok ti ova sprema rucak a deca  koju ti je rodila ti ili skacu po glavi ili ih izvlacis pijane iz kafica

W. mi svedok ( bar za 2) - ovo su prakticno 3 razlicita ampa ......... osnovni kvalitet im je zajednicki,  a razlike prave distinkciju na nivou licnih preferenci i ukusa
dakle ........... pominjanje "najboljeg" mi izaziva osmeh, eo vec se brew prva jutarnja
 
 

OK, I've compared graphs
B. XA252 waaaaay down in THD at all power levels, so no real comparison, except same THD Spectra nature (that is more "except")
then, THD levels comparison between B. XA252 SET and B. XA252 SIT clearly shows that SET is uniformly approx. 6db down at each tested power level
in my book, that's pretty good emulation - achieving same behavior and consistency, while still making some desired difference ...... even ignoring that we are emulating nearly 100$ part (plus not so easy to obtain) with 25$ part
edit: for SET - did I said that even famous ∀ Class DEF current distribution is clearly evident - Schade SIT emulation is working as proper SIT in DEF - I like to see it as SIT being error corrector for Mosfet  
 
 

pominjanje "najboljeg" mi izaziva osmeh, dok cekam da se brew prva jutarnja
to ti je kao da kontempliras koja je zena najbolja ....... dok ti ova sprema rucak a deca  koju ti je rodila ti ili skacu po glavi ili ih izvlacis pijane iz kafica

W. mi svedok ( bar za 2) - ovo su prakticno 3 razlicita ampa ......... osnovni kvalitet im je zajednicki,  a razlike prave distinkciju na nivou licnih preferenci i ukusa
dakle ........... pominjanje "najboljeg" mi izaziva osmeh, eo vec se brew prva jutarnja
 
 

Babelfish XA252 SET - graphs , 4R load, BFR=22R
 
everything the same, load changed to 4R
that's it; my preference sez that I'm not even going to try tests with 510R for BFR
as expected (ZM being lazy .......... I'm going to really check that maaaaybe later tonight, to actually compare graphs one by one) - this one being somewhere in the middle between B. XA252 and B. XA252 SIT

Babelfish XA252 SET - graphs , 4R load, BFR=22R
 
everything the same, load changed to 4R
that's it; my preference sez that I'm not even going to try tests with 510R for BFR
as expected (ZM being lazy .......... I'm going to really check that maaaaybe later tonight, to actually compare graphs one by one) - this one being somewhere in the middle between B. XA252 and B. XA252 SIT

Babelfish XA252 SET
 

as my pal Indra, member of same Pantheon and evidently same Caste to which I belongs, asked ....... here is schm of Babelfish XA252 SET
fancyschmancy name for Schade iteration of full Mos OS, where upper output Mosfet is Schaded, so practically being emulation of SIT
gate resistor R50 increased to 750R, introduced new resistor R58 (18K)
SIT related parts (two rectangles of short dash lines) mounted - as for SIT iteration, but instead of M1 - IRF510 (we are using for SIT), placed DN2540
R46 changed to 33R
we need around 3V voltage level at left (inner) side of R50, so result as is - DN2540 gate voltage is 3-4V-ish (fine tune of R46 possible to achieve full symmetry of M1 and M3 gate voltages, trivial task) ; these being referenced to output node
all parts titles ref. to attached schm
once when I have final pcb, containing all 3 amps , schmtcs with proper nomenclature will be posted
I could avoid T8-Q9 30mA CCS, and route lower end of R46 to output node (M2 source), but as I already had CCS in place, why not using it
yes, as Indra said - Papa's fave gigglywiggly graphs are saying that 2nd is neg. in phase ; that not posted, just simulated, but no reason for doubt

Babelfish XA252 gives you all details .........so you can form your own Opinion
Babelfish XA252 SIT gives you ready Opinion, with all details, and it doesn't care what you think
go figure
 
 

...... and I figured few tiny details, how to make Schade iteration

now, just need few logic level TO220 mosfets , to put N pucks back ....... an will inform ya

few days
 
 

Babelfish XA252 gives you all details .........so you can form your own Opinion
Babelfish XA252 SIT gives you ready Opinion, with all details, and it doesn't care what you think
go figure
 
 

Babelfish XA252 gives you all details .........so you can form your own Opinion
Babelfish XA252 SIT gives you ready Opinion, with all details, and it doesn't care what you think
go figure
 
 

Babelfish XA252 SIT - graphs , 4R load, BFR=510R

Load changed to 4 Ohms

current mirror is having programmed current at one side, while other side of current mirror is increasing or decreasing own current, so that voltage sags stays constant
current of "working" side of CM is changed simply by effect of changing voltage between rail and base, while emiter resistor is not changing ........ so effect must be change of current though part
contrary to that, reference halves of CM are having everything constant - both current through them, same as constant voltage between bases and rails

Babelfish XA252 SIT - graphs , 4R load, BFR=510R

Load changed to 4 Ohms

Pudding:
 
 

have some workshop unrelated things today and tomorrow, so second visit to SSE, with Babelfish XA252 SIT is postponed for Thursday
as I said, due to too much happenings (both in reality and in my head), I'm far from being capable of both critical and objective listening, thus need for visiting SSE
however, as I completed both SIT channels on T-Bed 2 yesterday, couldn't resist today afternoon and I did some listening in my workshop
Spoooooky and so much ball$$!
dunno (as said) how's in comparison with anything (I need probably just time to re-set, peaceful time without making new ones) but it's as microscope size of Palomar ......... Rocking!
sense of foundation and authority, as I remember, even greater than with 100W Babelfish Aleph XJ
go figure
ZM, Mad Hatter

to sto si dobio su po svoj prilici refurbished, naknadno punktovane duze nozice
nije cudo ako je koji skiknuo, a braca Kinezi ne proveravadu
testiranje - samo Nelsonov jig iz F3 Article

svak radi ono sto zna
evidentno logicari oce da imaju dobar preamp
onda uzmu sto ne znaju, a preinzenjerisu sto znaju
al neka, bitno da su srecni - sebi prave kako im se pravi
ja, sto mi ni stap ne treba kao daljinac, nisam merodavan

svak radi ono sto zna
evidentno logicari oce da imaju dobar preamp
onda uzmu sto ne znaju, a preinzenjerisu sto znaju
al neka, bitno da su srecni - sebi prave kako im se pravi
ja, sto mi ni stap ne treba kao daljinac, nisam merodavan

Conclusion !
 

My preferences:
-Babelfish XA252 (that being All Mos):
rails between 30 and 35Vdc - depending how much power is needed, Iq everything between 1A and 2A, depending how much aluminum is on disposal, BFR-22R
 
-Babelfish XA252 SIT:
rails 30Vdc, Iq 2A, BFR-22R
Hasta La Vista, Baby........ I'll be back!

Conclusion !
 

My preferences:
-Babelfish XA252 (that being All Mos):
rails between 30 and 35Vdc - depending how much power is needed, Iq everything between 1A and 2A, depending how much aluminum is on disposal, BFR-22R
 
-Babelfish XA252 SIT:
rails 30Vdc, Iq 2A, BFR-22R
Hasta La Vista, Baby........ I'll be back!

Babelfish XA252 SIT - graphs , 4R load, BFR=510R

Load changed to 4 Ohms

Babelfish XA252 SIT - graphs , 8R load, BFR=510R

.... everything same (rails +/-30V, Iq 1A7)