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Old 29th August 2012, 03:52 PM   #2851
DIGORA is offline DIGORA  Belgium
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Bonjour Christophe

http://www.audiodesignguide.com/Head...inputstage.JPG

This schematic look like current FeedBack but with Jfet
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Old 29th August 2012, 04:34 PM   #2852
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Quote:
Originally Posted by DIGORA View Post
Do you know the Pioneer Super Linear Circuit ?

This circuit could be adapted to use a current feedback as SSA?


the Headphone amplifier
Doesnt need to be adapted, it is current feedback, thats pioneer A9 like I mentioned in previous post, dates back to 1993 and one of the very best amps ever produced. The technology was quite advanced comparing european or american amps. Price was around 8000 US dollars. I dont need to post that one anymore then.
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Old 29th August 2012, 04:40 PM   #2853
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Originally Posted by dadod View Post
2) That is Hawksford enhaced cascode.
Indeed, THD figures for that amp are very good, Ive got 7 of these amps, 5 see daily use in bars (14 hours a day), 2 spare. They are however very reliable so spare ones are still boxed and never used. Its practically a SSA with hawksford cascode. Output uses Class H circuitry, bipolar and Mosfet.

Last edited by homemodder; 29th August 2012 at 04:43 PM.
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Old 29th August 2012, 04:45 PM   #2854
DIGORA is offline DIGORA  Belgium
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In fact I would like BJT input as SSA

Last edited by DIGORA; 29th August 2012 at 04:52 PM.
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Old 29th August 2012, 04:53 PM   #2855
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Theres not much of a choice nowadays anyway, there are no more toshiba complementary JFETs around, the ones that can be used in such a input stage have to be purchased in 1000 s to maybe get 100 pairs matched to Idss and gm.
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Old 29th August 2012, 07:18 PM   #2856
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Quote:
Originally Posted by DIGORA View Post
Bonjour Christophe
http://www.audiodesignguide.com/Head...inputstage.JPG
This schematic look like current FeedBack but with Jfet
Yes, it is. Nice schematic. Very clever.
No need for adaptation if this is the pioneer you were talking of. (The shematic i founded with google was absolutely different).
[edit]Why did-you like to change input's JFETs by a BJT ? They have their own advantage (noise factor/bandwidth/impedance)..
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Last edited by Esperado; 29th August 2012 at 07:24 PM.
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Old 29th August 2012, 07:40 PM   #2857
DIGORA is offline DIGORA  Belgium
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This schematic ( with 2sk1058 ) could have the same speed as your AMP ?

I have matched 2sk246Y 2SJ103Y
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Old 29th August 2012, 07:56 PM   #2858
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by DIGORA View Post
Do you know the Pioneer Super Linear Circuit ?

This circuit could be adapted to use a current feedback as SSA?

the Headphone amplifier
Quote:
Originally Posted by DIGORA View Post
Bonjour Christophe

http://www.audiodesignguide.com/Head...inputstage.JPG

This schematic look like current FeedBack but with Jfet
Which one have you asked in the first place, the headphone amp or the Pioneer? The Pioneer is current feedback, but "less CFB" than the SSA.

Quote:
Originally Posted by DIGORA View Post
In fact I would like BJT input as SSA
Same here. And I think the SSA is better than the headphone amp (just use the same BD139/140). The head-amp "trick" to lower distortion has consequence with the sound (tho not easily recognized). It is better using a string of dual silicon diodes like in the SSA. The resulting THD (and offset) will not as low as the head-amp but who needs super long trailing zeros anyway.
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Old 29th August 2012, 08:33 PM   #2859
DIGORA is offline DIGORA  Belgium
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Hello Jay,

I pasted this site link to illustrate my request about the SLC

I would like to make a very fast and linear amplifier with lateral mosfet output 2SK1058.

The speaker : http://www.hometheaterhifi.com/image...ance-phase.gif

Last edited by DIGORA; 29th August 2012 at 08:48 PM.
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Old 29th August 2012, 08:52 PM   #2860
shaan is offline shaan  India
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Hi digora.

Go for SSA, which is damn fast, super linear and has large power output.
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