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Old 26th April 2012, 01:44 PM   #291
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Quote:
Originally Posted by sonnya View Post
The OLG will not change much. The open loopgain is more or less set by the RC divided by the feedback resistors which are => 2K2/(36R||1K) => 2K2 / 34 => 65gg

It is multiplied by: (RLOAD/(1/gfs)).

For the exicon (10N20 and 10P20) it is: gfs = 2.5S @ ID=2.5A.

=>

65gg x (8/(1/2.5)) => 1300gg or 62dB.
OLG 62 dB is OK. Distortion spectral profile will be much more clear than before. What do you think, will you test it?
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Old 26th April 2012, 02:50 PM   #292
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I build the circuit from post 1 and also added constant current sources, but floating depletion mosfets. The sound got much better. Less distortion and bigger soundstage.
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Old 26th April 2012, 03:49 PM   #293
tinitus is offline tinitus  Europe
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Originally Posted by Lazy Cat View Post

I stated output power at -3 dB, so more relaxed, unclipped, not heavily distorted one.
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Old 26th April 2012, 04:09 PM   #294
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Originally Posted by Joachim Gerhard View Post
I build the circuit from post 1 and also added constant current sources, but floating depletion mosfets. The sound got much better. Less distortion and bigger soundstage.
What type? Siemens/Infineon BSP series?
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Old 26th April 2012, 04:11 PM   #295
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Supertex, the ones that SY uses in "His Masters Noise".
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Old 26th April 2012, 05:27 PM   #296
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
OLG 62 dB is OK. Distortion spectral profile will be much more clear than before. What do you think, will you test it?
I am not a fan of pure CLASS A (It is not ECO friendly ) but i will maybe test the attached version.

This way the current through the input BJT will be the same and symmetrical regardless of bias current and offset adjustment. => Every amp will sound the same way.
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Last edited by sonnya; 26th April 2012 at 05:29 PM. Reason: Picture rotated
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Old 26th April 2012, 05:36 PM   #297
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I'm saddened to see how ppl nowdays put eco friendlyness before sound quality
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Old 26th April 2012, 05:46 PM   #298
sonnya is offline sonnya  Denmark
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Class AB is fine with me. But Pure class A dissipating +150Watt per channel, i think is a bit over the top when we struggle to keep CO2 emission down.

My own CFP EXICON's runs with 35Watt per channel.
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Old 26th April 2012, 06:10 PM   #299
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My current class A amp dissipates around 60-75 watts per channel with a bias of 2.5A, the previous one ran six Amps per channel. My lafet amp(2SK135 and 2SJ50) i have no clue on dissipation as its stone cold despite 150mA bias per channel.

All my other amp project run between 30-70mA bias per channel.
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Old 26th April 2012, 06:13 PM   #300
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Tekko View Post
My current class A amp dissipates around 60-75 watts per channel with a bias of 2.5A, the previous one ran six Amps per channel. My lafet amp(2SK135 and 2SJ50) i have no clue on dissipation as its stone cold despite 150mA bias per channel.

All my other amp project run between 30-70mA bias per channel.
Sorry i did not want to Pick on you...
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