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Old 28th July 2012, 02:34 PM   #401
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Quote:
Originally Posted by Rush View Post
Looks like JS-252N, you need 2 separate secondary windings.

Rush
Ha yes you're right! CT probably means they're not independant.

I'm in Taiwan right now.. I might go see James and investigate directly at the source one of these days....
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Old 28th July 2012, 02:55 PM   #402
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if you look closely at this image : http://jianshin.myweb.hinet.net/Dscf0012.jpg , it seems that their CT's can be untied , in fact - that you need to tie windings for making CT

so - good for this purpose
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Old 28th July 2012, 02:59 PM   #403
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Quote:
Originally Posted by Zen Mod View Post
if you look closely at this image : http://jianshin.myweb.hinet.net/Dscf0012.jpg , it seems that their CT's can be untied , in fact - that you need to tie windings for making CT

so - good for this purpose
The one pictured has 5 secondary windings.
I would stick with JS-252N.

Rush
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Old 28th July 2012, 03:02 PM   #404
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If you look closely, the one standing up is different from the one with pins exposed
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Old 28th July 2012, 03:03 PM   #405
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I was just investigating their logic .....
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Old 28th July 2012, 04:13 PM   #406
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Quote:
Originally Posted by Antoinel View Post
Thank you flocchini. The threads are rich with valuable information.
I completely agree. I read that F4 thread over and over until things sunk in.
I am really happy how the headphone amp turned out. The Jensens were such a nice touch. I need to order the ones mentioned in this thread. Nelson and Choky's suggestions are well worth considering
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Old 28th July 2012, 09:07 PM   #407
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Dodo's

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Old 29th July 2012, 02:35 PM   #408
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Quote:
Originally Posted by Zen Mod View Post
you can always build Halcro

yes, or the topology from
http://home.tiscali.nl/audio/FrontEndSchPcb.html
About the paper
http://home.tiscali.nl/audio/index.html
there is described an amp with such an approach to get very excellent measuring THD results.

About the paper
http://www.passdiy.com/pdf/zenamp.pdf
I read:
There are two most essential principles to audio amplifier design. The
first is simplicity. The second is linearity.
Einstein said: "Everything should be made as simple as possible, but no
simpler." Simplicity is a common element of the best and most subtle
designs. It is preferred for purely aesthetic reasons, but also because
fewer elements color the sound less, and lose less information.


Actually the opposite approach, for me the only right way in order to get good sonic results by listening tests.
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Last edited by tiefbassuebertr; 29th July 2012 at 02:37 PM.
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Old 29th July 2012, 05:06 PM   #409
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Quote:
Originally Posted by franzm View Post
Could this be an implementation of US Pat. 4,107,619 (Fig.2)?
franzm: The attached is a simplified output stage of a Threshold S/----[STASIS {R}] power amp. The highly linear NPN transistor voltage source amplifier [Nvs] controls multiple PNP transconductance amplifiers [Ptcas]. Nvs and P tcas are connected in parallel. Ditto for the complementary portion using the highly linear PNP voltage source amp [Pvs] and its affiliated NPN transconductance amplifiers [Ntcas]. Maybe your question pertained to this particular combination in the attached schematic. {1}: [Nvs] and [Ntcas], and its complement {2}: [Pvs] and [Ptcas]. Clearly each of {1} and {2} are configured like the output stage of F6 [e.g Nvs common collector loaded with a common emitter Ntcas]. Will their operation be like F6?
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Old 29th July 2012, 05:17 PM   #410
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no way , Jose

F5 like

MF A1 like

etc.
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