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Old 9th May 2019, 11:08 AM   #761
Twst is offline Twst  Norway
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Temporary cooking instead of my F6
Should be making music soon!

Thanks Zen Mod!
Following your instructions from the build thread was a breeze. Only had trouble with a faulty 10k pot for the offset - had to go with a 5k and a somewhat larger R18. But it seems to be stable and all good!
My THF51s from watanabetomoaki wasn't really matched, but it will have to do for now
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Old 9th May 2019, 11:16 AM   #762
Zen Mod is offline Zen Mod  Serbia
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looking good!

common mode chokes could be better , but not really sure for SissySIT , due to uneven loading of rails - Mosfet is always doing much harder work than SIT , so load on neg rail is greater than on pos

Ugs matching of THF is not critical , as long you're able to set Iq , who cares for Ugs difference
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Old 9th May 2019, 09:36 PM   #763
chede is offline chede  Germany
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Twst, that amp looks great !
I like the three-dimensional Meccano-style construction that enables your "significant" power supply ...
It is a pity to hide the beautiful Toroidy transformers inside the amp ...


In my build, I'm happy with 4 pieces in my PSU of the little brother of the chokes you used - 156B (1.5 mH, 5 A, 70 mOhms).

SissySIT is absolutely deadly totally silent on my 100 dB/W widebanders.

I'm listening to it at the moment - it's the most transparent and informative and also explicit amp in my system so far, very nice tone, nice bite where necessary as well, not too aggressive. It's hard to do something else (like reading this forum) while listening, which in my book is a desirable quality

Thanks, Zen Mod, for this amp !

Best regards,
Claas

Last edited by chede; 9th May 2019 at 09:41 PM.
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Old 9th May 2019, 10:17 PM   #764
Zen Mod is offline Zen Mod  Serbia
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though , I have few things to complain about Twst's work:

-base plate is wrong oriented , lip better to put up , so no waste of space under it - one can place all mains cables beneath

-signal cables are too thick

-his work space is too tidy

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Old 10th May 2019, 12:45 AM   #765
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by chede View Post
....
Thanks, Zen Mod, for this amp !

......
almost forgot .......... let's just blame Pa, as always

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Old 10th May 2019, 07:38 AM   #766
Twst is offline Twst  Norway
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Quote:
Originally Posted by Zen Mod View Post
looking good!
Thanks!
Quote:
Originally Posted by Zen Mod View Post
common mode chokes could be better , but not really sure for SissySIT , due to uneven loading of rails - Mosfet is always doing much harder work than SIT , so load on neg rail is greater than on pos
Chokes was just an experiemnt - I dont think they to much different than resistors - but they certainly add up weightwise giving the amp a good feel in my back when moving it..

Quote:
Originally Posted by Zen Mod View Post
Ugs matching of THF is not critical , as long you're able to set Iq , who cares for Ugs difference
Yuup, seems fine - SITs reads 2V6 and 3V5 @ 23v 2A and biases up fine. Had to mess a little with the offset adjustment of the highest one, but changing R18 did the trick

Quote:
Originally Posted by chede View Post
Twst, that amp looks great !
Thanks mate!
Quote:
Originally Posted by chede View Post
It is a pity to hide the beautiful Toroidy transformers inside the amp ...
I know they are in there - makes me sleep so much better
Quote:
Originally Posted by Zen Mod View Post
though , I have few things to complain about Twst's work:
Of course you do

Quote:
Originally Posted by Zen Mod View Post
-base plate is wrong oriented , lip better to put up , so no waste of space under it - one can place all mains cables beneath
Pfft, gives more air and room for screws to not scratch anything

Quote:
Originally Posted by Zen Mod View Post
-signal cables are too thick
Should 15cm cable make a difference, it the same cable all the way to my sources

Quote:
Originally Posted by Zen Mod View Post
-his work space is too tidy
You haven't seen my other tables where I actually do the work


And for sound - this thing is unique. Especially in the top end. It is really pulling out all the details and even the details in the details. It's not sounding anything like the M2 or the other firstwatt builds of mine, that's for sure.
Feeding it directly form my Katana gives a large soundstage in my horns on top of the cornscala bass cab.
There are no noise or hum coming from this amp, and that's cool. Had some mu-metal ready for the input autoformers - but it doesn't seem necessary at all.

As for the details, it kinda seems over the top with some recordings - making it somewhat bright/fatiguing. But not the regular sibiliant kinda bright. Might settle after a while - but overall I am impressed with the involving soundstage of this thing

And oh, it runs a little hotter than I expected. Its like aleph hot!

Now, back to music
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Old 10th May 2019, 07:44 AM   #767
chede is offline chede  Germany
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What about an Acrylic / Perspex / Plexiglass top cover ?
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Old 10th May 2019, 11:03 AM   #768
Zen Mod is offline Zen Mod  Serbia
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@Twst - it'll settle ..... everything needs some burn in , caps in PSU , Iron , little Elna ....

our Italian friend found that he prefer higher voltage 1uF MKC as bypass for Elna Silmic (vs. these MKC I'm sending) , but I can't confirm - didn't tried and ....... I'm blessed with some time spent with Elephants , so my ears are much easier satisfied than ears of regular Greedy Boy

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Old 19th May 2019, 01:44 AM   #769
Mazeppa is offline Mazeppa  United States
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SissySIT option 2 kit has arrived in Arkansas.

Now to re-read the thread before I heat up the soldering iron and lay my probably too eager hands on it.
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Old 19th May 2019, 11:19 AM   #770
Zen Mod is offline Zen Mod  Serbia
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funny - never before happened - 3 kits delivered in same day in USA

do not forget reading this thread : Babelfish M25, SissySIT - general building tips and tricks

if in doubt with tiniest thing , ask
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