TSSA - The Simplest Symmetrical Amplifier - Page 64

sonnya · 17th May 2012, 09:26 PM

The monotonic behavior is due to its low OLG. With feedback it is difficult to obtain monotony because of the requirement of the dominant pole. but the lower OLG helps, or should we say masks the performance at lower frequencies.

You could go for a quad pack lateral!

I am waiting on the 2SJ79 and 2SK216.

I have a broker that could offer them within 3 days, I need to take more but i will maybe go this path. If i don't get a response.

Under all circumstances i know that the parts from the broker is original and checked.

Next week i will assemble them for test. (garden needs to be done this weekend)

Joachim Gerhard · 09:33 PM

I am looking forward to your build. It should sound very good as long as you do not push it. On my system with 98dB sensitivity i rarely go over 5 V so in my case it is a very good solution. I think speakers with very low sensitivity is not a good start anyway although there are many out there with huge reputation that are under 84dB but 350kG in weight.

Joachim Gerhard · 17th May 2012, 09:33 PM

Getting some 2SJ79 and 2SK216 is a good investment. I use them in preamps for example.

sonnya · 17th May 2012, 09:49 PM

Quote:

Originally Posted by Joachim Gerhard

I am looking forward to your build. It should sound very good as long as you do not push it. On my system with 98dB sensitivity i rarely go over 5 V so in my case it is a very good solution. I think speakers with very low sensitivity is not a good start anyway although there are many out there with huge reputation that are under 84dB but 350kG in weight.

Magico Q5

ha ha ha ha ha.

Q3 is down to 2,7Ohm at certain frequencies.

I can only agree with you. This one is for effective speakers even horn speakers will benefit from this.

Like this:

TQWT-

But i think Horn speakers are a german landmark....

Joachim Gerhard · 17th May 2012, 09:59 PM

My system at the moment is very similar. Waveguide and 20cm bass-midrange but in a dipole with an active m-dipole sub. Yes, horns get more popular here but more in the DIY scene. The so called High End is still the domain of low sensitivity, brute force stiffed, damped and low sensitivity "beauties". This is slowly changing partly because of the grotesque huge power amps that where all the rage 10 years ago. Problem is that many have this amps and they are hard to sell.

Lazy Cat · 18th May 2012, 07:26 AM

Quote:

Originally Posted by Joachim Gerhard

LC, i missed you at the High End. I did not find the time to test the modules again and i do not even know if i ever will because MiiB and I have changed the circuit again. Our version simulates also with 0,06% THD. That is of cause no world record but it is only 2nd harmonic, driver or not. 3rd is down 1/1000 times so i expect a good sound. I have still my first version playing and even that super simple execution sounds excellent.
I am using a cap multiplier in the PSU. It is dead quiet and makes no on or off plop.

Hi Gerhard

Yes I know, but that can also be the reason maybe to visit some other event in near future.

Does yours & MiiB's version also consist of two stages only (input-output) or you have some kind of voltage amplifying stage in between? Is it so much different from Sonnya's?

This kind of distortion results are very good considering the input stage has to do everything (differentiating plus amplifying) and for that kind of combination as you already stated, class A would be the best measured-sounding.

boyet0173 · 18th May 2012, 08:19 AM

Quote:

Originally Posted by Joachim Gerhard

LC, i missed you at the High End. I did not find the time to test the modules again and i do not even know if i ever will because MiiB and I have changed the circuit again. Our version simulates also with 0,06% THD. That is of cause no world record but it is only 2nd harmonic, driver or not. 3rd is down 1/1000 times so i expect a good sound. I have still my first version playing and even that super simple execution sounds excellent.
I am using a cap multiplier in the PSU. It is dead quiet and makes no on or off plop.

Hi Joachim Gerhard, Can I have your version of TSSA schematic? I want to build. Thank you in advance. I want to give thanks also to LC.

Regards,
Boyet

Joachim Gerhard · 18th May 2012, 12:55 PM

Hi Boyet !
Our version is somewhat different from Sonnyas but performance is nearly the same so i recommend you build Sonnyas version. There is a PCB and there is support something that MiiB and I can not supply at the moment because we are very busy in our day job and also have to support the MPP thread.

Joachim Gerhard · 18th May 2012, 01:02 PM

Here is some information about cap multipliers for class A amplifiers. Capacitance Multiplier Power Supply Filter
For class A they are ideal because there is a constant current draw. For class AB they can be used too but then the output cap that is in this example 1000uF has to be raised to at least 10.000uF.

sonnya · 18th May 2012, 01:48 PM

I do not agree on this one. When you exceed the class A region, the current draw is not constant any longer.

17th May 2012, 09:31 PM	#632
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I am looking forward to your build. It should sound very good as long as you do not push it. On my system with 98dB sensitivity i rarely go over 5 V so in my case it is a very good solution. I think speakers with very low sensitivity is not a good start anyway although there are many out there with huge reputation that are under 84dB but 350kG in weight. Last edited by Joachim Gerhard; 17th May 2012 at 09:33 PM.

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17th May 2012, 09:26 PM	#631
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	The monotonic behavior is due to its low OLG. With feedback it is difficult to obtain monotony because of the requirement of the dominant pole. but the lower OLG helps, or should we say masks the performance at lower frequencies. You could go for a quad pack lateral! I am waiting on the 2SJ79 and 2SK216. I have a broker that could offer them within 3 days, I need to take more but i will maybe go this path. If i don't get a response. Under all circumstances i know that the parts from the broker is original and checked. Next week i will assemble them for test. (garden needs to be done this weekend)

17th May 2012, 09:33 PM	#633
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Getting some 2SJ79 and 2SK216 is a good investment. I use them in preamps for example.

17th May 2012, 09:59 PM	#635
Joachim Gerhard diyAudio Member Join Date: Mar 2009	My system at the moment is very similar. Waveguide and 20cm bass-midrange but in a dipole with an active m-dipole sub. Yes, horns get more popular here but more in the DIY scene. The so called High End is still the domain of low sensitivity, brute force stiffed, damped and low sensitivity "beauties". This is slowly changing partly because of the grotesque huge power amps that where all the rage 10 years ago. Problem is that many have this amps and they are hard to sell.

18th May 2012, 12:55 PM	#638
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Hi Boyet ! Our version is somewhat different from Sonnyas but performance is nearly the same so i recommend you build Sonnyas version. There is a PCB and there is support something that MiiB and I can not supply at the moment because we are very busy in our day job and also have to support the MPP thread.

18th May 2012, 01:02 PM	#639
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Here is some information about cap multipliers for class A amplifiers. Capacitance Multiplier Power Supply Filter For class A they are ideal because there is a constant current draw. For class AB they can be used too but then the output cap that is in this example 1000uF has to be raised to at least 10.000uF.

18th May 2012, 01:48 PM	#640
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	I do not agree on this one. When you exceed the class A region, the current draw is not constant any longer.