TSSA - The Simplest Symmetrical Amplifier - Page 73 - diyAudio
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Old 29th May 2012, 01:11 AM   #721
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My simple prototype has a quite sweet treble too. I attribute that to the Class A mostly and like it. The Musical Fidelity A1 was also that way but it is not that extreme. Maybe it is the 2nd harmonic.
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Old 29th May 2012, 06:40 AM   #722
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Joachim Gerhard View Post
My simple prototype has a quite sweet treble too. I attribute that to the Class A mostly and like it. The Musical Fidelity A1 was also that way but it is not that extreme. Maybe it is the 2nd harmonic.
Yeah I'm not comfortable with the HF distortion either, but it doesn't disturbing soundwise.

May be part of the reason is because the weakest link is usually in the tweeter and we get used to listening unnatural trebles (besides, there is no music there either).

But as a push-pull amplifier, the TSSA behaves like a single-ended amplifier. Nice harmonics, and look at that phase behaviour! Very little increase in THD with increasing power. In the past, this is perceived by many as the characteristics of good amplifiers.
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Old 29th May 2012, 06:47 AM   #723
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There is a way to get the second harmonic away ( e.g. not totally ).
Use two TSSA amplifiers in a balanced setup per channel. I would do it with a Thats chip or even better with a transformer but then a good one is expensive.
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Old 29th May 2012, 06:59 AM   #724
AKSA is offline AKSA  Australia
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Do you really want to do that, Joachim?

There is the psychoacoustic masking effect of a small H2 component.....

Hugh
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Old 29th May 2012, 07:06 AM   #725
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I do not worry about the second.
In a listening test done at Prof.Dr.Klippel i could not hear better then 1% THD, no matter how hard i tried. On second harmonic alone i did even much worse.
That was done over headphones with a clean signal as reference.
I just wanted to talk about that option, just in case.
Here is the Thats chip i am talking about :http://www.thatcorp.com/datashts/THA..._Datasheet.pdf
That adds also some gain that may be useful or not.
My preferred way of doing it would be a transformer, unfortunately the best ones from Lundahl cost around 150,-€ each.

Last edited by Joachim Gerhard; 29th May 2012 at 07:11 AM.
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Old 29th May 2012, 07:10 AM   #726
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I my craze i ordered two of this .
http://www.lundahl.se/pdf/7901_02.pdf
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Old 29th May 2012, 07:19 AM   #727
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Here is a link to the Klippel listening test :Listening Test
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Old 29th May 2012, 07:25 AM   #728
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There is another way to isolate distortion :Distortion Isolation in the Time Domain
I worked with Bill Waslo on this in 2006. It also works with amplifiers.
It did not catch up much though unfortunately.
Endless debate what is audible or not, mostly anecdotal : YES
Using serious research to find out the limits of the human ear : NO
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Old 29th May 2012, 08:09 AM   #729
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Quote:
Originally Posted by Joachim Gerhard View Post
There is a way to get the second harmonic away ( e.g. not totally ).
Use two TSSA amplifiers in a balanced setup per channel. I would do it with a Thats chip or even better with a transformer but then a good one is expensive.
Many DACs give a balanced o/p so going balanced from DAC to Speakers is in fact the simplest option - I will be testing this option later this year.

I guess if you need transformers you have either have a S/E o/p DAC or an analogue S/E source.
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Old 29th May 2012, 08:16 AM   #730
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Joachim Gerhard View Post
There is a way to get the second harmonic away ( e.g. not totally ).
Use two TSSA amplifiers in a balanced setup per channel. I would do it with a Thats chip or even better with a transformer but then a good one is expensive.

I will try that idea. First with many small input transformers that I have on hand (but never tried to find out how bad they really are). Next, with JFET circuit (the TSSA benefits from such circuit in the input)

Quote:
Originally Posted by AKSA View Post
There is the psychoacoustic masking effect of a small H2 component.....
Hugh, what do you mean by that? Is that something bad? Do you mean that if the H2 is removed/reduced then it will not sound as nice because the 3rd order (and above) harmonics (which is dominant at HF) become audible?

F5 has the capability (balancing the FB) to tune in 2nd harmonics but it seems many prefer the "clean" version. And in term of distortion spectrum I see the TSSA is not different than the F5.
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