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Old 24th August 2018, 06:39 PM   #1
Zen Mod is offline Zen Mod  Serbia
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Opening new thread , to make things easier to follow and comment .

Everything started with collective brainstorming in Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans thread , and resulting prototype posted in #618 , Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans

Tnx to all Greedy Boyz involved ........

as I wrote , SissySIT ( in fist time called SUFI-SIT , but then I realized that too much seriousness is ..... too serious ) is practically THF51-S Tokin SIT nested in Babelfish M25 circuit (even pcb) , with necessary change in some parts values .

so , schm and last/final pcb iteration are these :

(observe that I finally decided to match my pcbs to DiyAudio UMS ...... taking in account Jason's and 6L6's stance - better keeping things less complicated , than asking for few more taps in existing UMS..... so , besides SissySIT being Sissy , ZM is Mighty Sissy , doing things to save Greedy Boyz from some drilling/tapping efforts)


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Last edited by Zen Mod; 25th August 2018 at 10:24 PM. Reason: changed images at user request
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Old 24th August 2018, 06:47 PM   #2
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few general notes:

- yes , it is Poor Man's iteration of SIT-3
-yes, same pcb for Babelfish M25 and SissySIT , skipping/adding few parts for each and using few different parts values for each
-yes,you can choose what to use in circuit - Edcor, Jensen , or Cinemag ; see complicated xformer area - footprint/pads included for all 3 of them

now , to keep this post more interested , placed few pics of my dear T-Bed (from previous thread) :

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Old 24th August 2018, 06:54 PM   #3
Zen Mod is offline Zen Mod  Serbia
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to quote myself , it was little trouble , who could expect that ........ sims aren't so precise regarding biasing network resistor values (few important factors missing in models , most important of them being gate leakage current)

so , had to heavily alter some resistor values - against values predicted by dummy sims made by even dumber operator , but solved it

I'm pretty satisfied , THF51-S not exactly being PapaSIT (read - made for sissy audio purposes) , but real tough welding drek

intended PSU is classic FW format - Donut with 2x18Vac secondaries , usually resulting in some 22V5dc rails (use CRC in filtering bank)

Iq , say between 1A8 and 2A

actual conditions in T-Bed are 25Vdc rails and Iq of 2A

due to damn big THF case , even 0.1mm thick mica is good enough for THF case being just slightly warmer than metal beneath it

so , 1W measurements (EMU1212 , DIY interface box , ARTA) are :

(FW SIT-3 , as reference , having approx. 0.15% 1W/4R and 0.21% 1W/8R)
Attached Images
File Type: png SissySIT 1W 4R.png (65.2 KB, 350 views)
File Type: png SissySIT 1W 8R.png (67.3 KB, 280 views)
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Last edited by Zen Mod; 24th August 2018 at 06:58 PM.
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Old 24th August 2018, 07:01 PM   #4
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10W at 4R and 8R

SIT-3 , 0.6%/4R and 1%/8R
Attached Images
File Type: png SissySIT 10W 4R.png (64.5 KB, 259 views)
File Type: png SissySIT 10W 8R.png (66.3 KB, 179 views)
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Old 24th August 2018, 07:05 PM   #5
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Quote:
Originally Posted by Zen Mod View Post
I'm pretty satisfied , THF51-S not exactly being PapaSIT (read - made for sissy audio purposes) , but real tough welding drek
Sound resemble DefeSIT aka SIT-3? I assume it does not sounds like M2.
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Old 24th August 2018, 07:07 PM   #6
Zen Mod is offline Zen Mod  Serbia
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FW SIT-3 declared as 18W/8R and 30W /4R

having THD of , say, 2% at 18W/8R and 2.3%/4R

from some reason (excitement , what else) , I forgot to measure at 30W/4R .... so including what I have - 18W/8R and 16.5W/4R ..... was probably shooting for same amount of THD

disclaimer - these mesaurements made with additional 6db autoformer in-between EMU and amp; it's probably adding some THD of it's own , but who cares

edit: Tea- will answer that later , with more info
Attached Images
File Type: png SissySIT 18W 8R.png (79.3 KB, 198 views)
File Type: png SissySIT 16.5W 4R.png (79.6 KB, 150 views)
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 24th August 2018 at 07:16 PM.
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Old 24th August 2018, 07:14 PM   #7
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you can see from my measurements vs. SIT-3 data - difference between PapaSIT and THF51-S nature ........ SIT-3 is characteristically having lesser THD on 4R load , while THF is having lesser on lesser (8R) load ; as I see it - result of PapaSIT being developed for lower rails voltage/higher current (pretty much FW form factor/audio usage) , while Tokin Biggie being ... what it is - shaker table/industrial workhorse

final graphs, Freq. response at 4 and 8R load , 1W
Attached Images
File Type: png SissySIT Freq. response 1W 4R.png (58.5 KB, 194 views)
File Type: png SissySIT Freq. response 1W 8R.png (58.0 KB, 182 views)
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Old 24th August 2018, 07:27 PM   #8
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now, Tea asked for comparison with little jewel (little just in physical size , not in sound ) DEFiSIT ....... for my ears , and for my regular sets of second ears .... same magic is there ; speed , details , authority .....

maybe I can say that SissySIT is somewhat Berserked DEFiSIT , and note that all comparisons are made between properly made DEFiSIT (dual mono and whatnot, with Cinemags on input) , while SIssySIT is still "just" T-Bed iteration - with crappy PSU common for both channels , ubercrappy powerwiring and Edcors on input

as illustration , set of measurements of my dear DEFiSIT ......

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Old 24th August 2018, 07:34 PM   #9
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few pics of SissySIT in action , in my workshop

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Old 24th August 2018, 07:47 PM   #10
Zen Mod is offline Zen Mod  Serbia
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while I'm still on the Mountain , not yet arrived at peak with my fave concrete pole , to sit on , both amps are at my friend's ...... he's regular user of my Babelfish J2 , so to paraphrase his words :

Quote:
-same sound character
-same musicality
-in this phase -old PSU caps , Edcor instead of Cinemag, common PSU , lousy wiring - little rougher than DEFiSIT
-space , resolution ........ everything as per wish

comparison with Babelfish J2 ...... higher level of resemblance to tube sound , but most important difference is in details presentation.... BJ2 is presenting details as is , direct to head , whily SissySIT is more subtle .... same as difference in sound presentation of Benz Micro LPS and Ortofon SPU Royal cartridges ... both worth having and enjoying
Attached Images
File Type: jpg at Woland's.jpg (66.5 KB, 352 views)
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