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Old 31st July 2012, 06:51 PM   #481
Zen Mod is offline Zen Mod  Serbia
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I gave you already two or more full schmtcs ........

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Old 31st July 2012, 06:52 PM   #482
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yes and these made me behave like this.....

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Old 1st August 2012, 09:18 AM   #483
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OK , nuff with tease


here is intended second F6 iteration ;

Poor Man's F6 is with plain SS SJEP as output , and Real McCay is with Papasits (just slight change in bias nets) ; with appropriate change in price , and Jensens with Silver wire coils :
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File Type: pdf Papas F6 SIT L'amp.pdf (17.5 KB, 265 views)
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Old 1st August 2012, 09:50 AM   #484
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Do i get two more wishes?
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Old 1st August 2012, 09:55 AM   #485
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whatever you wish , Son .....

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Old 1st August 2012, 10:20 AM   #486
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Quote:
Originally Posted by Zen Mod View Post
Real McCay is with Papasits (just slight change in bias nets) and Jensens with Silver wire coils :
This is what I am thinking on. Course i dont haev SiT's, but Perhpas SiC's will do. Might as well add Sh'T.
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Old 1st August 2012, 11:32 AM   #487
flg is offline flg  United States
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So, what do we know?
We know there is a comp buffer at the input.
From Posts #61, 88, 214, 292 and of coarse #253 we know there is a 4 X 600 Ohm transformer windings. We don't however know how, where or if all 4 are used. I'll bet that 2 primaries are paralelled. In post #214 NP comments you can use 2 1:1s so? Also, I beleive that buffer will probably do OK driving 2 600 ohm windings?
And we know there is a "clasic" Quasi Comp looking Sic output stage.
We also see some (AC) feedback there?
Naturally there are other components and just because it's a classic there is no reason not to expect a little Pass twist?
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Old 1st August 2012, 12:36 PM   #488
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Quote:
Originally Posted by flg View Post
So, what do we know?
We know there is a comp buffer at the input.
From Posts #61, 88, 214, 292 and of coarse #253 we know there is a 4 X 600 Ohm transformer windings. We don't however know how, where or if all 4 are used. I'll bet that 2 primaries are paralelled. In post #214 NP comments you can use 2 1:1s so? Also, I beleive that buffer will probably do OK driving 2 600 ohm windings?
And we know there is a "clasic" Quasi Comp looking Sic output stage.
We also see some (AC) feedback there?
Naturally there are other components and just because it's a classic there is no reason not to expect a little Pass twist?
Pa wrote exact Jensen type ; it's 4x150R , where you're using primaries in parallel , and secondary as drawn , so all 4 windings are used

as I wrote about my crude testing few posts above - 50R siggene doesn't sweat driving two 150R prim. in parallel


isn't enough of twist bringing to light some old techniques , combined with modern parts?
besides that - be sure that some thorough work is behind that schmtc

fact that every Toobhead is aware of them doesn't diminish measure of twist ....

in fact - I'm having old Pioneer SX1000T receiver besides me on the shelf (FM FE Nuvistors , everything else Germainum , Silicium T03 cans) where phase splitter is made exactly the same , with exactly same logic for feedback net .

whatever , it wasn't me who proposed that schmtc , but wittier Joker than me .....

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Old 1st August 2012, 01:33 PM   #489
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Quote:
Originally Posted by flg View Post
..... In post #214 NP comments you can use 2 1:1s so? Also, I beleive that buffer will probably do OK driving 2 600 ohm windings?......
yes , of course ; two identical 600:600 xformers , both primaries in parallel (in phase ) , then secondaries as drawn

in that case - it will buffer going to be happier than driving two (Jensen's) 150R primaries in parallel ?

that's strictly matter of blending with primary inductance , not matter of impedance ; xformers are - so called - 600:600 or whatever - those numbers are information of intended purpose ( each one dictating inductance and Rdc of windings ) but , generally speaking , one can find xformer specimens with similar inductance , one called 150 Ohms , other one called 600 Ohms , third one called 1K Ohms .

in this ( and many other cases ) reflected impedance to source , in this case load which buffer is seeing , is matter of input impedance of each output gate mechanismus , then these two in parallel ...... then that transferred 1:1 through winding ratio back to buffer

conclusion - ratio is what's counts most , combined with load ; only knowing (or anticipating these during construction ) we can say how's source-xformer-load combo called , in regard to how-many-Ohms

then - depending how much inductance is (so called 150, or so called 600, or so called 1K , whatever) in primary - that will reflect in left F3 , phase behavior etc.

higher range (impedance ) xformer will be safer regarding left F3 and phase behavior , but it will present more troubles in right F3 (capacitance between windings ! ) and slightly worse generator for gates (of output Jfets)

whoa ! I'm sorta spinnin' in circles now ......
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Last edited by Zen Mod; 1st August 2012 at 01:39 PM.
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Old 1st August 2012, 02:28 PM   #490
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O.K. gotta go look up that jensen post...
Yes, I agree. the 150/600 "it matters not"...
But, it's good to be driving primary's R with 1/10th source impeadance. 2 "150" ohm primaries may not be so easy. But, as you suggest, sacrifice some of the left for some of the right
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