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Old 14th January 2013, 01:45 PM   #3441
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by generg View Post
......
BTW why do you want to take a complementary pair of SITs and no two SK82? Many of us may have at home....
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Old 14th January 2013, 02:51 PM   #3442
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Quote:
Originally Posted by Zen Mod View Post
because I have ( well , not exactly "I" , but Bata Bane - he acquired them for rejuvenating his Papa's TA-5650) leftovers - 2+2 pairs ;

whatever - it's easy to accommodate biasing scheme for complementary , taking care of Pa's arrangement (upper ref. to gnd) ; I would still go to both biasing circs based on floating supplies , it's easier to grasp

as I said - it's easy to be smart post hoc

...you guys talking about hindsight ?..... being portuguese my latin is not so good!
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Old 14th January 2013, 03:48 PM   #3443
generg is offline generg  Germany
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sorry Zen Mod, I must have mixed up something.....in one thread you were speaking of SK16 (?) and SK60....

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Old 14th January 2013, 03:50 PM   #3444
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I understood post hoc to mean hindsight. Don't feel bad, my hindsight isnt even any good

Riding the coattails!
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Old 14th January 2013, 03:59 PM   #3445
CeeVee is offline CeeVee  Portugal
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Originally Posted by buzzforb View Post
....Riding the coattails!
me too...I'm trying not to loose my hold on them ...

I was just trying to get ZM let us know what he's building his nice shiny new Box with Huge heatsinks for....thought it might be something like this ...with Papa SITs he's got !

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Old 14th January 2013, 04:24 PM   #3446
Zen Mod is offline Zen Mod  Serbia
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Originally Posted by generg View Post
sorry Zen Mod, I must have mixed up something.....in one thread you were speaking of SK16 (?) and SK60....

G

as I'm saying HERE and HERE , I have some pairs of 2SJ18+2SK60 in drawer ; using 2SK82 is even better (for quasicomplementary iteration) , due to their higher ratings
of course , one must be aware of rank (bias voltage ) of exact VFets one is having on disposition , so accordingly dimensioning bias net ( exact values in final voltage resistive divider


Quote:
Originally Posted by CeeVee View Post
......
I was just trying to get ZM let us know what he's building his nice shiny new Box with Huge heatsinks for....thought it might be something like this ...with Papa SITs he's got !
nice and shiny (gold sinks) will be something (lips sealed ) , while Babelfish SIT-2 will be made in really old school fashion boxes

these two are on shorter rope , I mean - in line before F6 iteration from post #3431
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Old 14th January 2013, 05:46 PM   #3447
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Originally Posted by Zen Mod View Post
correct , and not correct

facts :
1. xformer windings are quadrifilar ; that means somewhat highish capacitance between them
2.lower secondary is sort of sitting on lower rail potential all the time , while
3. upper secondary is floating with output potential ;

result: that (2 vs. 3) , and fact that upper biasing net is really using it's bootstrap function , is really introducing capacitance issue in game

whatever - as Pa said - that's not an issue if you are aware of it - sonic results of F6 are confirming that

our beta testing guys ( you know who you are ) already gave us primary info about that ; with your chip about flipping places of SS , we know more
your truly , Mighty Boy ZM

In a past post, Mr. Pass suggested that two separate transformers can be used instead of a quadrifilar. Will this alleviate some of the issues raised above. I am also speculating that one can readily introduce a deliberate and favourable gain assymetry [tranformers not 100% matched], and their reduced interwinding capacitance [by physical separation] will extend the amp's frequency response beyond 5KHz before employing Pass loop feedback.
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Old 14th January 2013, 05:57 PM   #3448
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using two xformers in battery will change things maybe just a little , but that will introduce other complications

gain asymmetry ( different secondary loading ) is already covered in thread

all roads are leading to Rome
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Old 14th January 2013, 06:07 PM   #3449
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Quote:
Originally Posted by Zen Mod View Post


joking , off course

here's quick draw of Sony Vfet complementary F6 concept

time for another public disgrace of Mighty ZM



I'm not going to try it in next ...... 6 months ......... or even later

disclaimer - my main spks are 16 Ohms , so for my needs everything is relaxed , regarding OLG , CLG ,NFB,yukyuk

edit : recommended reading , needed for circuit calc : https://dl.dropbox.com/u/20665608/SONY%20VFET%20AES.rar , tnx to RK R

dunno how long it will be there , so down it

editedit : for sorta useful logic for circ calc , see Pa's BA3 article ; scroll down to my comment , where I done all work , decrypting differences between explanation and schm nomenclature
Zen Mod: Will there be an electrical problem if one kept the biasing Vgs on all the time in both of your schematics? If no problem, then we will have a simpler execution of your designs.
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Old 14th January 2013, 06:08 PM   #3450
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using two xformers in battery will change things maybe just a little , but that will introduce other complications

gain asymmetry ( different secondary loading ) is already covered in thread

all roads are leading to Rome
or Serbia
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