Ultrasimple SIT PP amp from BAF , or SIT Beast with a Thousand PSUs - Page 2 - diyAudio
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Old 8th October 2013, 05:10 PM   #11
Zen Mod is offline Zen Mod  Serbia
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here it was , several months ago , in frenzy F6 thread : F6 Amplifier

Click the image to open in full size.

Click the image to open in full size.

I'm sure that Pa shouldawouldacoulda make it mucho simpler , with few voltage multipliers etc (taking in account appropriate RC constants for main vs. aux PSUs) ;

however , for really fast-finger-solder ones , Juma already made what's needed in his SIT PP thread


regarding SIT availability :

Quote:
Originally Posted by Nelson Pass View Post
I had an exhausting but very good time at BAF yesterday.

Many thanks to all the people who were so helpful, particularly Jill (SWMBO),
Mark (not so much), Dana, and the two Pauls.

Apologies to Scott when my phone went off during his talk. I don't how to
work the thing...

Shortly I'll start posting the stuff I had.

In the meantime,

CircuitDIY Affortable Components for Hobbyists

sales@circuitdiy.com

is a reliable source for the Sony 2SK82 and 2SJ28. They have confirmed
that they have good quantities of these in the "E" rank, which I used,
and when those J's are depleted they have more J's in the "F" rank,
which should also work fine, just different Idss.

When they run out, you will have to start sending me bottles of Cab.

Quote:
Originally Posted by Zen Mod View Post
this is reputable seller , according to Greedy Boyz :

Vfet Sony's RARE 2SK82 and 2SJ28 Ke 33 Vfet 1 Pair | eBay
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Last edited by Zen Mod; 8th October 2013 at 05:17 PM.
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Old 8th October 2013, 05:20 PM   #12
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by PKI View Post
Is it possible to cool these TO-3 transistors passively? What are dissipations 60w/device...

hear what Pa sez :

Quote:
Originally Posted by PSz. View Post
Keep AR2's photos handy when you watch this. I'm sure someone will post better video soon, but here is something for the greedy boys.
Pass at BA2013 - YouTube
Quote:
Originally Posted by Zen Mod View Post
tnx

in a meantime , here is real quickie SForged* audio from your Utoob :

https://dl.dropboxusercontent.com/u/...%20Sforged.mp3

*means - mono-ed , cleaned , Eq-ed , normalised , mp3-ed

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Old 8th October 2013, 05:36 PM   #13
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Sony CS XFRMR ultra minimal amplifier schematic by Nelson Pass
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File Type: jpg Mr Nelson Pass.jpg (714.2 KB, 1075 views)
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Old 8th October 2013, 05:39 PM   #14
OllBoll is offline OllBoll  Sweden
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What if you have a balanced source already, would it be possible to do something like this and skip the transformer?
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File Type: jpg Almost as simple SIT.jpg (32.8 KB, 455 views)
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Old 8th October 2013, 05:42 PM   #15
Zen Mod is offline Zen Mod  Serbia
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yup

but , if you're able to do that (safely) , then you aren't in need to ask that sort of question

whatever - is there any benefit of introducing nasty caps instead of divine xformer ?

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Old 8th October 2013, 05:45 PM   #16
PKI is offline PKI  United States
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Didn't Pa say: cap is better than xformer, arguably ;-)
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Old 8th October 2013, 05:51 PM   #17
Zen Mod is offline Zen Mod  Serbia
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Default should we call it ..... Mickey Mouse Amp ?

while Mighty ZM said - xformer , when used for several tasks in same time , is better than anything .....

Mickey Mouse Brave Little Tailor - Disney Classics Old Movies Songs Full Episodes Length Channel - YouTube



shhhhh

I'm expecting Buzz to chime in , with his 5-fillar xformer .....
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Old 8th October 2013, 05:55 PM   #18
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Quote:
Originally Posted by Zen Mod View Post

whatever - is there any benefit of introducing nasty caps instead of divine xformer ?


What if the balanced source has already nasty output caps?
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Old 8th October 2013, 06:02 PM   #19
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Quote:
Originally Posted by PKI View Post
Didn't Pa say: cap is better than xformer, arguably ;-)
Yeah I do remember him saying that, at least at the output, he might feel differently about it used as a voltage gain device driving high impedance.
Pa likes to play freely, there's no progress if you build stuff you already know works well.
Notice that in this amp he was able to select a transformer that gave a flat distortion vs frequency response curve.
I think the buffer front end will be almost mandatory for quite a few of us
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Old 8th October 2013, 06:05 PM   #20
PKI is offline PKI  United States
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He also used them coz he had them left from F6 amps ;-). What if you have an external buffer like B1, still need one in the front?
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