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Babelfish XA252 / Babelfish XA252 SIT/ Babelfish XA252 SET


Zen Mod

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prepis sa Big DiyA

no way da kucam ponovo, zato copy-paste

 

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Few years ago, we had enormous fun in funny named thread : F4 Beast Builders : https://www.diyaudio.com/forums/pass-labs/300233-f4-beast-builders.html

Well, you can call it Group of Hysteric Housewives Brainstorming  :smesna:

Result of that was that I have myriad of back of napkin sketches, and after these I started simulating ...... and simulating ... and simulating

After myriad of these ( out of sheer enthusiasm I even made pcb files for some of iterations), I finally had made nice smallish channel pcbs, containing OS having different-ish approach to biasing than Papa's original XA25 is having, while FE was in principle same as Papa's, but with few beautiful quirks, of which I was damn proud (yup, Mighty ZM reinventing Da Wheel, time and time again)

And they were sitting, populated, on my shelf ........ always being pushing to bottom of list; I knew they would work, but somehow I wasn't content with overall picture

Now, recently - besides revising biasing mechanismus for SissySIT ( resulting in R.3) and few other amps, I also made FE called Plethora of Pinjatas ( or just Plethora, short) and found interesting to combine it in sitting Babelfish XA25 project

Plethora Fe having both SE and Bal inputs as matter of choice, called to adding another "2" in name , so result is Babelfish XA252

Plan is also to have iteration of DEF OS ( real SIT, no emulation in form of Schaded Mosfet), thus addition of "SIT" in name, so Babelfish XA252 / SIT

Find enclosed cumulative schematic, and will do edits of this post, if and when needed

OK1-OK2-TH1 .......... 10A limiting circuit, Savior of Our Souls, blatantly stolen from Pa 

 

Babelfish XA252 - SIT sch.png

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I did planned before to make it, but finally made T-Bed 2 , as proper cradle for prototyping this

from one of pics, you can clearly see that ZM is Chicken , executing first power up and settings with IRFP240/9140 and 2A fuses in rails...... did it with smallish Iq, and later - when I was happy camper, changed to Biguns

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Graphs , 8R load, BFR=22R
 

FE is made as more or less basic LTP thingy; though, I did wanted to have possibility of altering THD level by changing OLG in simple and predictable way - which I made in also basic way - tearing LTP halves ( each halve having own CCS) and introducing common degeneration resistor ( practically changing length of effective Tail of LTP) , which I then named as Beauty Factor Resistor, short BFR

as you will see, changing value of that resistor is chhanging OLG, thus changing amount of overall NFB, and as result we have lesser or higher THD level

Luckily, Spectra is not changing, and that was a goal 

now - set of measurements with highest possible OLG - BFR s 22R

Rails are 30Vdc ( amp projected to work with rails of 30-35Vdc with no changes)

Iq 1A7

DC offset and Iq practically not changing in temperature domain

While varying mains voltage (nominal 230Vac) between 200Vac and 255Vac - DC offset is changing some 20mV, while Iq is practically not changing

Good enough for me 

Load for these graphs is 8R; each graph is having title captured, so you can see what/how much

due to 30Vdc rails, clipping smidge above 40W

with 35Vdc rails, clip near 55W

who needs that ?

 

B. XA252 1W 8R.png

B. XA252 5W 8R.png

B. XA252 10W 8R.png

B. XA252 15W 8R.png

B. XA252 20W 8R.png

B. XA252 25W 8R.png

B. XA252 30W 8R.png

B. XA252 35W 8R.png

B. XA252 40W 8R.png

B. XA252 Fr. 8R.png

B. XA252 THD vs. Fr. 8R.png

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Graphs , 8R load, BFR=510R
Everything the same, but BFR changed to 510R, that being opposite extreme to 22R - practically lowest OLG which I considered

B. XA252 1W 8R.png

B. XA252 5W 8R.png

B. XA252 10W 8R.png

B. XA252 15W 8R.png

B. XA252 20W 8R.png

B. XA252 25W 8R.png

B. XA252 30W 8R.png

B. XA252 35W 8R.png

B. XA252 40W 8R.png

B. XA252 Freq. 8R.png

B. XA252 THD vs. Freq. 8R.png

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E bas ti necu nista lajkati!
Stisnut cu lajk kad Wolly napise valja li to icemu. 
......................................
 [emoji3] 

Ma šta nas briga za njegovo grejanje[emoji16].
Valjda postoji profesionalna čast “prvog uha foruma”[emoji16].
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E bas ti necu nista lajkati!
Stisnut cu lajk kad Wolly napise valja li to icemu. :tongue10:
......................................
 [emoji3] 
valja - u stvari odlično je, a to izjavljujem oficijelno [emoji3]

47f499902e5ad55f7f9866bfe218e3d8.jpg

po objektivnim kriterijumima, a to bi prvenstveno bila količina izobličenja (nema ih), harmonijska šema (usklađena, drugi naglašeniji), neutralnost i dubina scene, ovo pojačalo je možda i najbolje koje je izašlo iz ZM kujne

analitično ali nije naporno, detaljno ali i muzikalno - sa njim bi moglo veoma lepo da se živi..

izmaltretirasmo ga materijalom koji bi lako pokazao slabosti (prvenstveno Come in - Kremer - Gridenko - Martynov):

3075fe555131474b04743d6028b385a2.jpg

ff4ae2332c23d1a016aaebe9b440cf8e.jpg

097e332c78b050121abef713dfa0b959.jpg

2c5af71089f245cc688957a5a4a302b7.jpg

107d193de2cf4026bdc1409d46fd2c4f.jpg

ali, odolelo je [emoji846]

karakterom najsličnije BJ2, ali nešto "pitomije" od njega.. problem je što je lestvica podignuta veoma visoko pa vilici nije lako da padne.. a, pala bi i ostala tako [emoji846]

veoma snažno pojačalo, držalo je Irona na prvoj trećini (na phono ulazu na četvrtini) snage

čestitam [emoji846][emoji106]

P.S. a još smo se lepo i družili, Vrač i ja naravno [emoji846]
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pre 8 minuta, Woland reče

valja....


Hvala! :drinks:
Nikada ne sumnjam u Allmighty-eve skalamerije. Citavo desetljece citam kako opisuje koju (komercijalnu, cesto vintage)  skalameriju i buduci da sam srecom mogao ponesto od toga i cuti kod drugih ljudi sam se uvjerio da slicno (ne) cujemo i da nam se ono sto nam godi ne razlikuje u bitnim stvarima, a to je prvenstveno muzikalnost sto god ta rijec znacila.  Masa skalamerija ima detaljnost i izgleda da odavno nije problem to postici, ali to da reproducirana muzika ima svoj tok, da zvuk ima svoju "vlagu" (ne pitaj me na sto mislim jer ne znam objasniti), svoju prisutnost, mesa na kosturu cak i u visokim tonovima, uvjerljivu palpabilnost sam iskusio jako rijetko i to na nevidjeno skupim setupima kod Boze u Pakracu, te kod svog, na zalost pokojnog prijatelja.

Samo sam htio da se jos malo pise/prica jer ne mogu sam cuti, a otici ce u zaborav jer ce do kraja ljeta napraviti jos pet (boljih) pojacala.
Tako, neka ostane bar negdje neka rijec o usporedbi sa necim drugim.
Na koncu, ne u blizoj buducnosti, ali ne vise niti u tako neodredjeno dalekoj, moram i ja naruciti nesto od toga. Samo da sklopim te zvucnjake i gramofon, pa kad se naviknem na novo stanje da odaberem neki od zacina iz Zenove kuhinje...ili na neku od furuna jer sve zapravo griju. :D 
Po tvom opisu, ovo bih mogao ´ladno kupiti i bez slusanja...a tako nekako ce i biti - kad dodje vrijeme.

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3 hours ago, Aleks said:

Gdje ima ovih izlaznih XP7373RH1736FGD u prodaji?

Hteo potati kod nas, da nije Mouser, Farnell itd?

ima Mou, digi

nabavljas jal preko sprinta ili vremenoplova

ene, manja iteracija ovoga sa railovima nazivno 24V i IRFP mosfetima ce bude uskoro

manja snaga ali i manja disipacija i svi delovi tepsija ribe

izoblicenja isto smrt malecka, THD Spectra ista - dominantan 2nd, amp ne obrce fazu, harmonik negativna faza

radni i finalni naziv ampa - Plethora of Pinjatas

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valja - u stvari odlično je, a to izjavljujem oficijelno [emoji3]

47f499902e5ad55f7f9866bfe218e3d8.jpg

po objektivnim kriterijumima, a to bi prvenstveno bila količina izobličenja (nema ih), harmonijska šema (usklađena, drugi naglašeniji), neutralnost i dubina scene, ovo pojačalo je možda i najbolje koje je izašlo iz ZM kujne

analitično ali nije naporno, detaljno ali i muzikalno - sa njim bi moglo veoma lepo da se živi..

izmaltretirasmo ga materijalom koji bi lako pokazao slabosti (prvenstveno Come in - Kremer - Gridenko - Martynov):

3075fe555131474b04743d6028b385a2.jpg

ff4ae2332c23d1a016aaebe9b440cf8e.jpg

097e332c78b050121abef713dfa0b959.jpg

2c5af71089f245cc688957a5a4a302b7.jpg

107d193de2cf4026bdc1409d46fd2c4f.jpg

ali, odolelo je [emoji846]

karakterom najsličnije BJ2, ali nešto "pitomije" od njega.. problem je što je lestvica podignuta veoma visoko pa vilici nije lako da padne.. a, pala bi i ostala tako [emoji846]

veoma snažno pojačalo, držalo je Irona na prvoj trećini (na phono ulazu na četvrtini) snage

čestitam [emoji846][emoji106]

P.S. a još smo se lepo i družili, Vrač i ja naravno [emoji846]

Tooooooo!
Hvala!
Mika bi trebalo da kriptuje ovu i slične teme jer ako neki časopis tipa Stereophile nabasa na nju, ostaćemo bez Wolija[emoji16].
Uz dužno poštovanje Zen, ko bi nam onda “prevodio” one silne grafike, sheme …..
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pre 5 minuta, Zen Mod reče

kaze ovi moji nisu neutralni



Pa to je strasno!
Pristrani su, znaci????
 :Viannen_loungelizard:
.............................
(Pristrani, uvijek drze stranu muzici!) :D 

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