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Old 26th November 2010, 11:05 AM   #91
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Quote:
Originally Posted by generg View Post
this version sounded best ......
so - hybrid SS/IRF ......


power on 8 and 4 ?

what's AC gain of A CCS ?

and sound , comparing to two crown shark ?
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Old 26th November 2010, 10:12 PM   #92
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The results are embarrassing,

With the J-fet inputstage the SemiS sound better than the IRF in the signalpath and the aleph current sound mix with the IRF is not so pleasant to my ears, so better no aleph feedback.

But with the original IRF9610 input stage and the IRF output stage it's another world of sound, more earthbound, more dynamic, sharper, a little bit more dirty in sound.

Of course not the resolution, the airiness of the J-FETs ..... It seems difficult to get both.

Is it possible the j-fet input stage I used has no good point to work, because I loose 17V over the 1k resistor leading to the SK170, from the positiv 24V ?

I did not hear Babel two crowns for over a week, because I have only one set of power supply, but for the sure it was the best sound I heard up to now.
But only 13 W at 4 ohm is not much and wanted to see what the alephs can do.
And I do not want to stop to make experiments. I think I need another set of heatsinks and so on that I can hear with the best set I have and at the same time experiment with another set.
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Old 26th November 2010, 10:23 PM   #93
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Quote:
Originally Posted by generg View Post
.....
Is it possible the j-fet input stage I used has no good point to work, because I loose 17V over the 1k resistor leading to the SK170, from the positiv 24V ?

......
that's irrelevant

that 1K resistor is just saving your CCS from excessive dissipation ;

there is no embarrassing result ... when one is learning from results

try Babelfish Two Crowns with 2 pairs in output
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Old 16th January 2011, 10:35 AM   #94
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Dear Generg,

I'm very inetested your post. Can you tell me what is SSR100?
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Old 16th January 2011, 11:07 AM   #95
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It is one of the new Semisouth J-FETs Nelson Pass uses.....

http://www.semisouth.com/products/up...0_rev1%202.pdf

Tea-bag sells them matched!
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Old 16th January 2011, 05:03 PM   #96
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Quote:
Originally Posted by generg View Post
My main question is the Aleph CCS still working after all modifications?, Should I readjust it? In which direction to keep the high power with 4 Ohm.

Are at high power levels both, the SemiR100 and the IRF working together, so I get a sound mix?
You want to adjust it for best measurement and/or best
sound. Ideally the Aleph IRF240's will not contribute
much to the sound on their own, but of course no situation
is ideal. I can tell you that they measure a little
differently than other FETs in the same spot.

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Old 16th January 2011, 05:21 PM   #97
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Quote:
is ideal. I can tell you that they measure a little
differently than other FETs in the same spot.
thank you Mr. Pass for your comment!

Unfortunately I do not understand the meaning of the quotation above....

The IRF240 measure a bit differently than.....? Semisouth?
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Old 16th January 2011, 07:31 PM   #98
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G.

any other active device in that position ( Aleph CCS) will sound different
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Old 16th January 2011, 08:17 PM   #99
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THX Zen Mod for clearing the meaning!
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Old 16th January 2011, 09:01 PM   #100
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ZM

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