TSSA - The Simplest Symmetrical Amplifier - Page 43

sonnya · 29th April 2012, 06:49 PM

Quote:

Originally Posted by Joachim Gerhard

Sure, that will work too. Nevertheless i build the version with driver first and then we can compare.

No problem - go ahead!

Lazy Cat · 29th April 2012, 07:52 PM

Quote:

Originally Posted by Joachim Gerhard

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?

Joachim Gerhard · 29th April 2012, 07:56 PM

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.

Lazy Cat · 29th April 2012, 08:01 PM

OK, no rush, tomorrow than.

I also intend to visit the High End, celebration for the ears and eyes, best European show.

MiiB · 29th April 2012, 08:06 PM

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.

Joachim Gerhard · 29th April 2012, 08:07 PM

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.

Joachim Gerhard · 29th April 2012, 08:11 PM

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.

MiiB · 29th April 2012, 08:28 PM

Lazy....You are also welcome in the Raidho boot....please introduce yourself when there...

Lazy Cat · 29th April 2012, 08:36 PM

Quote:

Originally Posted by MiiB

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.

Lazy Cat · 29th April 2012, 08:38 PM

Quote:

Originally Posted by MiiB

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.

29th April 2012, 08:06 PM	#425
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	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. __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/

29th April 2012, 08:28 PM	#428
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	Lazy....You are also welcome in the Raidho boot....please introduce yourself when there... __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/

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29th April 2012, 07:56 PM	#423
Joachim Gerhard diyAudio Member Join Date: Mar 2009	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.

29th April 2012, 08:01 PM	#424
Lazy Cat diyAudio Member Join Date: Sep 2007	OK, no rush, tomorrow than. I also intend to visit the High End, celebration for the ears and eyes, best European show.

29th April 2012, 08:07 PM	#426
Joachim Gerhard diyAudio Member Join Date: Mar 2009	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.

29th April 2012, 08:11 PM	#427
Joachim Gerhard diyAudio Member Join Date: Mar 2009	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.