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Old 29th April 2012, 06:49 PM   #421
sonnya is offline sonnya  Denmark
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Originally Posted by Joachim Gerhard View Post
Sure, that will work too. Nevertheless i build the version with driver first and then we can compare.
No problem - go ahead!
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Old 29th April 2012, 07:52 PM   #422
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Originally Posted by Joachim Gerhard View Post
Sure, that will work too. Nevertheless i build the version with driver first and then we can compare.

I think it will sound better with driver, 50 mA driver's bias, pure class A, 22 ohm gate-source of the output device, real impedance drive only. Total input stage isolation from the output current, can't do better than this in a simple manner.

What stage of TSSA are you in Gerhard?
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Old 29th April 2012, 07:56 PM   #423
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Very close but today is sunday and i have to prepare for the High End.
Some wiring and then i can test on the bench. Maybe today, maybe tomorrow.
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Old 29th April 2012, 08:01 PM   #424
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OK, no rush, tomorrow than.

I also intend to visit the High End, celebration for the ears and eyes, best European show.
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Old 29th April 2012, 08:06 PM   #425
MiiB is offline MiiB  Denmark
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in simulation the driver does not improve distortion or distortion profile...more current seems better..It's a tricky beast and small changes means a lot...Think it needs a lot of IRL tweaking to get things right.
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Old 29th April 2012, 08:07 PM   #426
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I am at the Fast Audio boot. You can see an interesting preamp with phono stage i designed. It has tone controls and a tube output stage.
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Old 29th April 2012, 08:11 PM   #427
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MiiB, on the other hand even the simple version of post 1 just enhanched with depletion mosfet CCS sounds very, very good. It may more the energy storage we hear and not so much the distortion provided we have no high order or bad sounding intermodulation.
Anyway, you are right. The task is now to find the sweet spots.
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Old 29th April 2012, 08:28 PM   #428
MiiB is offline MiiB  Denmark
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Lazy....You are also welcome in the Raidho boot....please introduce yourself when there...
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Old 29th April 2012, 08:36 PM   #429
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Originally Posted by MiiB View Post
in simulation the driver does not improve distortion or distortion profile...more current seems better..It's a tricky beast and small changes means a lot...Think it needs a lot of IRL tweaking to get things right.
We can do more current with MOSFET Darlington too

I think it will be better with drivers, especially these ones Gerhard has, these are the best.

It would be interesting to here about your opinion Gerhard, since hearing both, super simple and now this one in the same system, that really counts the most.

Yes, I can visit you both at High End, Miib probably at Raidho booth, not probably but sure.
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Old 29th April 2012, 08:38 PM   #430
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Lazy....You are also welcome in the Raidho boot....please introduce yourself when there...
Just saying that, yes of course we'll meet, gladly. Thanks.
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